WatchGuard Agent improper authentication allows unauthenticated remote code execution

published 2026-08-25 2 mo ago modified 2026-09-28 41 d ago also EUVD-2026-65438

cvss: 9.3; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

Improper authentication in the WatchGuard Agent allows an unauthenticated attacker with network access to cause the agent to execute arbitrary code with elevated privileges.

Patch / fix

fixed in 1

WatchGuard WatchGuard Agent 1.17.01.0000, 1.17.21.0000, 1.25.13.0000

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 2 mo ago (2026-08-25)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

WatchGuard WatchGuard Agent

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality
CWE-347 Improper Verification of Cryptographic Signature
CWE-494 Download of Code Without Integrity Check

References

psirt.watchguard.com /CVE-2026-57910
vendor-advisory

Sources

CVE List CVE-2026-57910
NVD CVE-2026-57910

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary