VULNERABILITY INTELLIGENCE

CVE-2021-22981

CVSS score4.8 MEDIUM
EPSS probability0.56%
CISA KEVNot currently listed
Published2021-02-12
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Description

On all versions of BIG-IP 12.1.x and 11.6.x, the original TLS protocol includes a weakness in the master secret negotiation that is mitigated by the Extended Master Secret (EMS) extension defined in RFC 7627. TLS connections that do not use EMS are vulnerable to man-in-the-middle attacks during renegotiation. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Weakness classification

  • nvd@nist.gov: NVD-CWE-noinfo

Primary references