4.8

CVE-2025-4804: watchguard fireware os Cross-site Scripting

CVSS: 4.8v4.0MediumDeferred
Published 16-05-2025Last modified 08-08-2026
Open JSON

Vulnerability summary

CVE-2025-4804 is a medium (CVSS 4.8) Cross-site Scripting vulnerability in watchguard fireware os. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.2% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.46%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 16-05-2025
    PublishedVulnerability first disclosed.
  2. 08-08-2026
    Last modifiedVulnerability information updated.

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS allows Stored XSS via the spamBlocker module. This vulnerability requires an authenticated administrator session to a locally managed Firebox.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

+0.02 pp

From 0.45% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.46%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Watchguard1 product

1 vendor · 1 product

References

2 links