8.7

CVE-2025-55036: f5 big-ip Out-of-bounds Write

CVSS: 8.7v4.0HighAnalyzed
Published 15-10-2025Last modified 26-02-2026
Open JSON

Vulnerability summary

CVE-2025-55036 is a high (CVSS 8.7) Out-of-bounds Write vulnerability in f5 big-ip. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 26.8% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.35%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-10-2025
    PublishedVulnerability first disclosed.
  2. 26-02-2026
    Last modifiedVulnerability information updated.

Description

When BIG-IP SSL Orchestrator explicit forward proxy is configured on a virtual server and the proxy connect feature is enabled, undisclosed traffic may cause memory corruption.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

0.00 pp

From 0.35% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.35%

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

F52 products
  • big-ip≥ 17.1.0, < 17.1.3 | ≥ 16.1.0, < 16.1.6 | ≥ 15.1.0, < 15.1.10.8
  • big-ip_ssl_orchestrator≥ 15.1.0, < 15.1.10.8 | ≥ 16.1.0, < 16.1.6 | ≥ 17.1.0, < 17.1.3

1 vendor · 2 products

References

1 links