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VulnerabilityPublished Updated

CVE-2025-61933: F5 BIG-IP · Cross-site Scripting

Affects F5 BIG-IPSource CVE Database V5

0

Not known to be exploited · CVSS 6.1 Medium.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Oct 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
F5f5/big-ippkg:rpm/f5/big-ipOther threatsAffected
  • 15.1.0 – 17.5.0
4 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Organizations should implement the following specific mitigation measures: 1) Monitor F5’s official channels for patches addressing CVE-2025-61933 and apply them promptly once released. 2) Until patches are available, deploy web application firewall (WAF) rules to detect and block reflected XSS attack patterns targeting BIG-IP APM interfaces. 3) Conduct thorough input validation and output encoding on all user-supplied data in custom BIG-IP configurations or integrations to reduce injection risks. 4) Educate users about the risks of clicking unsolicited links, especially those purporting to lead to BIG-IP portals. 5) Restrict access to BIG-IP management and APM portals via network segmentation and VPNs to limit exposure. 6) Enable logging and alerting on suspicious web requests to detect potential exploitation attempts early. 7) Review and harden session management policies to minimize the impact of stolen session tokens. These targeted steps go beyond generic advice by focusing on immediate risk reduction and layered defenses specific to BIG-IP environments.

Description

A reflected cross-site scripting (XSS) vulnerability exists in an undisclosed page of BIG-IP APM that allows an attacker to run JavaScript in the context of the targeted logged-out user.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

References

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