CVE-2021-22981

MediumCVSS 4.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected software

No affected versions have been published.

Timeline

Published
Feb 12, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-22981: Medium severity, CVSS 4.8 | Vulnix