KEV Entry

CVE-2025-53521

Known Exploited Vulnerability Entry CISA

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Entry Details
Confirmed Exploited

CVE-2025-53521

2026-03-27 01:00 CET

Timestamps

2026-03-27

2026-03-27

Scope

F5 BIG-IP Stack-Based Buffer Overflow Vulnerability | Affected: F5 / BIG-IP | Description: F5 BIG-IP APM contains a stack-based buffer overflow 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

References
  • {'id': 'CVE-2025-53521', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-53521'}

20e6ea0a-08e4-457b-bf17-7ee1098b2bf3

CISA
405284c2-e461-4670-8979-7fd2c9755a60

2026-10-02 08:09 CEST

2026-10-02 08:09 CEST

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-121"
  ],
  "date_added": "2026-03-27",
  "due_date": "2026-03-30",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "BIG-IP",
  "vendorProject": "F5",
  "vulnerabilityName": "F5 BIG-IP Stack-Based Buffer Overflow Vulnerability"
}
 -
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