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Vulnerability record · CVE-2020-5938 · published 29 October 2020

CVE-2020-5938: F5 big-ip access policy manager inadequate encryption strength vulnerability

F5 · Big Ip Access Policy Manager

On BIG-IP 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, when negotiating IPSec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.

6.5 CVSS 3.1 Medium EPSS 0.53% · top 57.3% CWE-326 · Inadequate encryption strength
6.5CVSS 3.1 base score, v2 4.0
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

On BIG-IP 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, when negotiating IPSec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.f5.com/csp/article/K76610106 Vendor Advisory
https://support.f5.com/csp/article/K76610106 Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-5938), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.