CVE-2021-25122

unknown

Published 2021-06-16 · Modified 2026-02-04

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CVSS v3

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

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`9.0.43-1`
sid	Fixed	`9.0.43-1`
forky	Fixed	`9.0.43-1`
bullseye	Fixed	`9.0.43-1`
bookworm	Fixed	`9.0.43-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Maven	org.apache.tomcat.embed:tomcat-embed-core	`>=10.0.0,<10.0.2`	`10.0.2`
Maven	org.apache.tomcat.embed:tomcat-embed-core	`>=9.0.0,<9.0.43`	`9.0.43`
Maven	org.apache.tomcat.embed:tomcat-embed-core	`>=8.5.0,<8.5.63`	`8.5.63`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.