What is CVE-2025-36557?

CVE-2025-36557 is a high-severity vulnerability in F5 Big-ip, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2025-05-07.

How severe is CVE-2025-36557?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-36557 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in F5 Big-ip

CVE-2025-36557

When an HTTP profile with the Enforce RFC Compliance option is configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technica…

Vulnerability class: Buffer Overflow

EPSS: 0.006 (68.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

F5 Big-ip — versions 17.5.0, 17.1.0, 16.1.0
F5 Big-ip Next Cnf — versions 2.0.0, 1.1.0
F5 Big-ip Next Spk — versions 1.8.0, 1.7.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

my.f5.com/manage/s/article/K000139571 (vendor-advisory)

Frequently asked questions

What is CVE-2025-36557?: CVE-2025-36557 is a high-severity vulnerability in F5 Big-ip, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2025-05-07.
How severe is CVE-2025-36557?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-36557 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.