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CVE-2025-9242

WatchGuard · Firebox · WatchGuard Firebox Out-of-Bounds Write Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS91.3%99.8th percentile
Exploited3 KEV sources
Ransomware useUnknown
Federal fix dueDec 3, 2025
patch window

Called exploited 34 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing34d
  3. Last KEV listing22d
  4. Last sighting6mo

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by22 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

6 public reports collected from VulnCheck and CIRCL, first on Oct 21, 2025. Each links to its original source. We have not verified them.

Description

WatchGuard Firebox contains an out-of-bounds write vulnerability in the OS iked process that may allow a remote unauthenticated attacker to execute arbitrary code.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

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Our coverage of CVE-2025-9242

CVE-2025-14733critical

CISA: WatchGuard RCE flaw now exploited in ransomware attacks

Ransomware groups are actively exploiting a critical vulnerability in WatchGuard Firebox firewalls, according to CISA. The flaw, tracked as CVE-2025-14733, allows unauthenticated attackers to execute remote code with low complexity. While WatchGuard released patches in December, a significant number of devices remain vulnerable, with thousands still exposed online.