Which SIEM platforms have a CVE-2026-0300 detection rule?

df00tech provides CVE-2026-0300 (Palo Alto Networks PAN-OS Out-of-bounds Write (CVE-2026-0300)) detection queries for 7 SIEM platforms: Microsoft Sentinel / Defender, Splunk, Elastic Security (EQL), IBM QRadar (AQL), Sumo Logic CSE, Google Chronicle / SecOps, CrowdStrike LogScale (CQL).

What data sources are required to detect Palo Alto Networks PAN-OS Out-of-bounds Write (CVE-2026-0300) (CVE-2026-0300)?

Detecting Palo Alto Networks PAN-OS Out-of-bounds Write (CVE-2026-0300) requires the following data sources: CommonSecurityLog, AzureNetworkAnalytics_CL, Syslog.

What severity and confidence is the CVE-2026-0300 detection?

The CVE-2026-0300 detection is rated critical severity with medium confidence.

What are common false positives for CVE-2026-0300?

Common false positives for CVE-2026-0300 include: Legitimate vulnerability scanners (Tenable, Qualys, Rapid7) performing authorized assessments against PAN-OS management interfaces; PAN-OS software updates or content updates that trigger brief process restarts logged as crashes; High-volume authenticated API usage from automation platforms that may resemble volumetric anomalies.

CVE-2026-0300 Detection: Palo Alto Networks PAN-OS Out-of-bounds Write (CVE-2026-0300) (KQL, SPL, Sigma + 5 SIEMs)

Microsoft Sentinel / Defender

kusto

let timeframe = 24h;
let suspiciousPaths = dynamic(['/esp/', '/php/', '/sslmgr', '/global-protect', '/ssl-vpn', '/api/']);
let knownMgmtPorts = dynamic([443, 4443, 8443]);
union 
  (
    CommonSecurityLog
    | where TimeGenerated >= ago(timeframe)
    | where DeviceVendor == "Palo Alto Networks"
    | where Activity has_any ("threat", "vulnerability", "overflow", "memory", "crash", "segfault")
    | project TimeGenerated, DeviceVendor, DeviceProduct, Activity, SourceIP, DestinationIP, DestinationPort, Message, AdditionalExtensions
  ),
  (
    AzureNetworkAnalytics_CL
    | where TimeGenerated >= ago(timeframe)
    | where DestPort_d in (knownMgmtPorts)
    | where FlowStatus_s == "A"
    | summarize RequestCount = count(), UniqueSourceIPs = dcount(SrcIP_s) by DestPublicIPs_s, DestPort_d, bin(TimeGenerated, 5m)
    | where RequestCount > 500 or UniqueSourceIPs > 50
    | project TimeGenerated, DestPublicIPs_s, DestPort_d, RequestCount, UniqueSourceIPs
  ),
  (
    Syslog
    | where TimeGenerated >= ago(timeframe)
    | where ProcessName has_any ("pan_gp", "pan_comm", "sslmgrd", "authd", "configd")
    | where SyslogMessage has_any ("segfault", "core dump", "out of bounds", "memory corruption", "stack smash", "buffer overflow")
    | project TimeGenerated, Computer, ProcessName, SyslogMessage
  )
| extend CVE = "CVE-2026-0300"
| project-reorder TimeGenerated, CVE

Detects CVE-2026-0300 exploitation indicators in Palo Alto Networks PAN-OS by correlating CommonSecurityLog threat events, anomalous inbound traffic volumes to management ports, and syslog messages indicating memory corruption or process crashes on PAN-OS devices.

critical severity medium confidence

Data Sources

CommonSecurityLog AzureNetworkAnalytics_CL Syslog

Required Tables

CommonSecurityLog AzureNetworkAnalytics_CL Syslog

False Positives

Legitimate vulnerability scanners (Tenable, Qualys, Rapid7) performing authorized assessments against PAN-OS management interfaces
PAN-OS software updates or content updates that trigger brief process restarts logged as crashes
High-volume authenticated API usage from automation platforms that may resemble volumetric anomalies
Network monitoring tools performing continuous health checks against management ports

Splunk

spl

index=network OR index=firewall OR index=syslog earliest=-24h
| eval is_panos=if(vendor="Palo Alto Networks" OR sourcetype IN ("pan:firewall","pan:system","pan:threat","pan:traffic"), 1, 0)
| search is_panos=1
| eval exploit_signal=case(
    match(message, "(?i)(out.of.bounds|memory corruption|segfault|core dump|stack smash|buffer overflow)"), "memory_corruption",
    match(message, "(?i)(crash|fatal|abort|signal 11|sigsegv)"), "process_crash",
    match(message, "(?i)(threat.*overflow|exploit|cve-2026-0300)"), "direct_exploit_indicator",
    1=1, NULL()
  )
| search exploit_signal=*
| stats count AS event_count, values(src_ip) AS source_ips, values(exploit_signal) AS signals, earliest(_time) AS first_seen, latest(_time) AS last_seen BY host, dest_ip
| eval duration_minutes=round((last_seen - first_seen) / 60, 2)
| where event_count >= 2
| eval cve="CVE-2026-0300"
| table _time, cve, host, dest_ip, source_ips, signals, event_count, duration_minutes, first_seen, last_seen
| sort -event_count

Splunk detection for CVE-2026-0300 targeting PAN-OS devices. Searches PAN-OS sourcetypes for memory corruption, process crash, and direct exploit indicators, then correlates events by host and destination IP to surface multi-signal exploitation patterns.

critical severity medium confidence

Data Sources

Palo Alto Networks PAN-OS Syslog Network Firewall Logs

Required Sourcetypes

pan:firewall pan:system pan:threat pan:traffic

False Positives

Authorized penetration testing engagements with active scanners targeting PAN-OS
Legitimate software upgrade processes causing temporary process restarts logged as crashes
High-cardinality alerting environments where threshold tuning has not been applied to management traffic
Misconfigured logging pipelines that duplicate events and inflate event counts

Elastic Security (EQL)

eql

sequence by host.name with maxspan=10m
  [network where
    destination.port in (443, 4443, 8443) and
    network.direction == "inbound" and
    event.dataset == "panw.panos"
  ] with runs=5
  [process where
    event.dataset == "panw.panos" and
    (
      process.name in ("sslmgrd", "pan_gp", "configd", "authd", "pan_comm") and
      event.action in ("end", "crash", "terminate") and
      process.exit_code != 0
    )
  ]

Elastic EQL sequence detection for CVE-2026-0300. Correlates a burst of inbound connections to PAN-OS management ports followed by abnormal process termination of core PAN-OS daemons, indicative of memory corruption exploitation.

critical severity medium confidence

Data Sources

Elastic Agent with Palo Alto Networks integration packetbeat system logs

Required Tables

logs-panw.panos-* logs-system.process-*

False Positives

Planned PAN-OS content or software updates that restart management daemons
Network load balancer health checks generating bursts of connections to management ports
Legitimate high-frequency API polling from SIEM or SOAR integrations
Process monitoring tools that track daemon lifecycle and generate false termination events

IBM QRadar (AQL)

sql

SELECT
  DATEFORMAT(starttime, 'yyyy-MM-dd HH:mm:ss') AS event_time,
  sourceip,
  destinationip,
  destinationport,
  devicetype,
  category,
  "UTF8"(payload) AS raw_payload,
  QIDNAME(qid) AS event_name,
  logsourcename(logsourceid) AS log_source
FROM events
WHERE
  LOGSOURCETYPENAME(devicetype) ILIKE '%Palo Alto%'
  AND (
    category ILIKE '%vulnerability%'
    OR category ILIKE '%threat%'
    OR LOWER("UTF8"(payload)) LIKE '%out-of-bounds%'
    OR LOWER("UTF8"(payload)) LIKE '%memory corruption%'
    OR LOWER("UTF8"(payload)) LIKE '%segfault%'
    OR LOWER("UTF8"(payload)) LIKE '%core dump%'
    OR LOWER("UTF8"(payload)) LIKE '%cve-2026-0300%'
    OR (destinationport IN (443, 4443, 8443) AND eventcount > 100)
  )
  AND starttime > NOW() - 86400000
ORDER BY starttime DESC
LIMIT 1000

QRadar AQL query for CVE-2026-0300 targeting Palo Alto Networks log sources. Surfaces vulnerability and threat category events alongside payload indicators of memory corruption, and flags high-volume inbound traffic to PAN-OS management ports.

critical severity medium confidence

Data Sources

Palo Alto Networks PAN-OS via Syslog to QRadar QRadar Network Activity

Required Tables

events

False Positives

QRadar offense tuning not applied — raw AQL may return high event volumes from active firewalls
Authorized red team or vulnerability scanner traffic targeting management interfaces
PAN-OS HA (high availability) failover events that generate process restart messages matching payload patterns
Content updates or dynamic updates generating threat category events unrelated to active exploitation

Sumo Logic CSE

sql

_sourceCategory=network/paloalto OR _sourceCategory=firewall/panos
| where %"vendor" = "Palo Alto Networks" or _sourceCategory matches /palo*/
| parse "type=*]" as log_type nodrop
| parse "subtype=*]" as log_subtype nodrop
| parse "severity=*]" as severity_level nodrop
| where log_type in ("THREAT", "SYSTEM") or
  (%message matches /(?i)(out.of.bounds|memory.corruption|segfault|core.dump|buffer.overflow|stack.smash)/) or
  (%message matches /cve-2026-0300/i)
| eval exploit_signal = if(%message matches /(?i)(out.of.bounds|memory.corruption|segfault)/, "memory_corruption",
    if(%message matches /(?i)(crash|abort|fatal|sigsegv)/, "process_crash",
    if(%message matches /cve-2026-0300/i, "direct_match", "threat_log")))
| timeslice 5m
| stats count as event_count, values(src_ip) as source_ips, values(exploit_signal) as signals by _timeslice, _sourceHost
| where event_count > 3
| sort by event_count desc

Sumo Logic detection for CVE-2026-0300. Aggregates PAN-OS THREAT and SYSTEM log types alongside payload-level memory corruption and crash indicators, grouped by 5-minute windows to surface exploitation bursts.

critical severity medium confidence

Data Sources

Palo Alto Networks PAN-OS Syslog Sumo Logic Installed Collector on PAN-OS syslog server

Required Tables

_sourceCategory=network/paloalto _sourceCategory=firewall/panos

False Positives

High-volume legitimate traffic from internal scanning tools misconfigured to target management interfaces
PAN-OS automated content update cycles generating SYSTEM log bursts
HA clustering events creating duplicate SYSTEM log entries that inflate event counts
Sumo Logic source category misconfiguration mixing unrelated firewall logs with PAN-OS logs

Google Chronicle / SecOps

yaral

rule cve_2026_0300_panos_oob_write {
  meta:
    author = "df00tech Detection Engineering"
    description = "Detects CVE-2026-0300 exploitation indicators against Palo Alto Networks PAN-OS"
    severity = "CRITICAL"
    priority = "HIGH"
    mitre_attack_tactic = "Initial Access"
    mitre_attack_technique = "T1190"
    reference = "https://security.paloaltonetworks.com/CVE-2026-0300"
    cve = "CVE-2026-0300"

  events:
    (
      $e.metadata.product_name = "PAN-OS" or
      $e.metadata.vendor_name = "Palo Alto Networks"
    )
    and
    (
      (
        $e.metadata.event_type = "NETWORK_HTTP" and
        $e.target.port in (443, 4443, 8443) and
        $e.network.direction = "INBOUND"
      ) or
      (
        $e.metadata.event_type = "PROCESS_TERMINATION" and
        $e.target.process.command_line = /sslmgrd|pan_gp|configd|authd|pan_comm/ and
        $e.target.process.exit_code != 0
      ) or
      (
        re.regex($e.metadata.description, `(?i)(out.of.bounds|memory corruption|segfault|core dump|buffer overflow|CVE-2026-0300)`)
      )
    )

  match:
    $e.principal.hostname over 15m

  outcome:
    $risk_score = max(
      if($e.metadata.event_type = "PROCESS_TERMINATION", 85, 0) +
      if(re.regex($e.metadata.description, `CVE-2026-0300`), 95, 0) +
      if(re.regex($e.metadata.description, `(?i)(segfault|core dump)`), 75, 0)
    )
    $hostname = array_distinct($e.principal.hostname)
    $source_ips = array_distinct($e.principal.ip)

  condition:
    $e
}

Google Chronicle YARA-L 2.0 rule for CVE-2026-0300. Matches inbound management port traffic, abnormal PAN-OS process terminations, and payload-level memory corruption indicators on Palo Alto Networks devices, with risk scoring across signal types.

critical severity medium confidence

Data Sources

Google Chronicle with Palo Alto Networks ingestion parser Chronicle UDM

Required Tables

UDM events with product_name=PAN-OS

False Positives

Chronicle parser misconfiguration mapping non-PAN-OS events to the Palo Alto vendor namespace
Authorized internal vulnerability scans generating inbound management traffic matching network conditions
PAN-OS high-availability failover generating process termination events for monitored daemon names
Threat intelligence enrichment rules applying CVE tags to historical events unrelated to active exploitation

CrowdStrike LogScale (CQL)

cql

#repo=base_activity #kind=ProcessRollup2
| $cve = "CVE-2026-0300"
| $target_processes = ["sslmgrd", "pan_gp", "configd", "authd", "pan_comm", "routed", "sysd"]
| filter(
    ProductType = "Firewall" OR
    (event_simpleName = "ProcessRollup2" AND FileName IN $target_processes) OR
    (event_simpleName = "NetworkConnectIP4" AND LocalPort IN [443, 4443, 8443] AND Direction = "1") OR
    (event_simpleName = "CriticalEnvironmentVariableChanged") OR
    CommandLine CONTAINS "CVE-2026-0300"
  )
| select timestamp, ComputerName, UserName, FileName, CommandLine, LocalAddressIP4, RemoteAddressIP4, LocalPort, RemotePort, ExitCode, event_simpleName
| join type=left
  [
    #repo=base_activity #kind=ProcessRollup2
    | filter event_simpleName = "ProcessRollup2" AND ExitCode != 0 AND FileName IN $target_processes
    | select ComputerName, FileName, ExitCode, timestamp AS crash_time
  ]
  on ComputerName
| where isnotnull(crash_time)
| sort timestamp desc
| limit 500

CrowdStrike Falcon LogScale (CQL) detection for CVE-2026-0300. Correlates process crash events for known PAN-OS management daemons with inbound management port connections, surfacing devices where exploitation may have triggered memory corruption and process failure.

critical severity medium confidence

Data Sources

CrowdStrike Falcon sensor on PAN-OS management host CrowdStrike Network Containment telemetry

Required Tables

base_activity ProcessRollup2 base_activity NetworkConnectIP4

False Positives

CrowdStrike sensor deployed on PAN-OS VM host capturing unrelated process activity from co-located workloads
PAN-OS scheduled tasks or content updates triggering brief non-zero exit codes during daemon restarts
Authorized security tooling performing API calls that match management port inbound connection filters
Lab or staging PAN-OS appliances with aggressive update schedules generating frequent process lifecycle events

Vulnerability Intelligence

CVE

Affected Software

Weakness (CWE)

Timeline

References & Proof of Concept

CVSS

What is CVE-2026-0300 Palo Alto Networks PAN-OS Out-of-bounds Write (CVE-2026-0300)?

MITRE ATT&CK

Data Sources

Required Tables

False Positives

Data Sources

Required Sourcetypes

False Positives

Data Sources

Required Tables

False Positives

Data Sources

Required Tables

False Positives

Data Sources

Required Tables

False Positives

Data Sources

Required Tables

False Positives

Data Sources

Required Tables

False Positives

Sigma rule & cross-platform mapping

Platform-specific guides for CVE-2026-0300

Testing Methodology

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