Threats / WatchGuard / CVE-2022-26318
CVE-2022-26318
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
WatchGuard Firebox and XTM Appliances vulnerability
An unauthenticated remote code execution vulnerability in WatchGuard Firebox and XTM appliances allows arbitrary code execution without authentication.
Verdict
Today item — known-exploited.
Unauthenticated attackers can execute arbitrary code on affected WatchGuard appliances. The high EPSS score and active exploitation in the wild indicate immediate risk to exposed instances.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
4 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25).
Probability (EPSS)
EPSS 0.78303 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: WatchGuard, Firebox and XTM Appliances. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-122 Heap-based Buffer Overflow — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify a WatchGuard Firebox or XTM appliance exposed on the network without requiring authentication.
Business
Perimeter security infrastructure becomes a direct attack vector rather than a protective boundary.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I send a crafted request to trigger the buffer overflow condition and execute arbitrary code on the appliance.
Business
Attacker gains code execution within the security appliance itself, bypassing all downstream protections.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistence and pivot to internal network segments or exfiltrate traffic passing through the compromised appliance.
Business
Internal network compromise and potential data breach affecting all systems behind the firewall.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05