CVE-2025-53521 (GCVE-0-2025-53521)

Vulnerability from cvelistv5 – Published: 2025-10-15 13:55 – Updated: 2026-03-31 16:04
VLAI? CISA KEV
Title
BigIP APM Vulnerability
Summary
When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE).   Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 (Critical)
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
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
f5
References
Impacted products
Vendor Product Version
F5 BIG-IP Affected: 17.5.0 , < 17.5.1.3 (custom)
Affected: 17.1.0 , < 17.1.3 (custom)
Affected: 16.1.0 , < 16.1.6.1 (custom)
Affected: 15.1.0 , < 15.1.10.8 (custom)
Create a notification for this product.
Date Public ?
2025-10-15 14:00
Credits
F5 would like to thank Kristian Vlaardingerbroek, Hugo Trippaers, and other people of Schuberg Philis; Bart Vrancken; Fox-IT; and the National Cyber Security Centre (NCSC) in the Netherlands for their assistance in investigating this issue and following the highest standards of coordinated disclosure.
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f2792b14-1f12-4e06-a8c5-a28a376b8c65

Vulnerability ID: CVE-2025-53521

Status: Confirmed

Status Updated: 2026-03-27 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-03-27
Asserted: 2026-03-27
Scope
Notes: KEV entry: F5 BIG-IP Unspecified Vulnerability | Affected: F5 / BIG-IP | Description: F5 BIG-IP AMP contains an unspecified vulnerability that could allow a threat actor to achieve remote code execution. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-03-30 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): Please adhere to F5’s guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible F5 products affected by this vulnerability. For more information please see: https://my.f5.com/manage/s/article/K000156741 ; https://my.f5.com/manage/s/article/K000160486 ; https://my.f5.com/manage/s/article/K11438344 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53521
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes
Feed CISA Known Exploited Vulnerabilities Catalog
Product BIG-IP
Due Date 2026-03-30
Date Added 2026-03-27
Vendorproject F5
Vulnerabilityname F5 BIG-IP Unspecified Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-03-27 20:00 UTC | Updated: 2026-03-27 20:00 UTC
Show details on NVD website
To clipboard 

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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.