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High [CVE-2021-22977] On BIG-IP version 16.0.0-16.0.1 and 14.1.2.4-14.1.3, cooperation between malicious HTTP client code and a malicious server

This high-severity F5 advisory covers CVE-2021-22977 affecting BIG-IP.

CVE-2021-22977 Published Feb 12, 2021Updated by vendor Jun 17, 2026
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F5BIG-IP
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Summary

On BIG-IP version 16.0.0-16.0.1 and 14.1.2.4-14.1.3, cooperation between malicious HTTP client code and a malicious server may cause TMM to restart and generate a core file. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · medium-confidence parse· fetched 2 months ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 2 months ago·verify at source

Mitigation

The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 2 months ago·verify at source

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