CVE-2021-36368

low

Published 2022-03-12 · Modified 2026-05-29

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CVSS v3

3.7

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

CVSS v4 NEW

—

not yet in upstream

VIR risk

3.7

Description

An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed.

Predictions

Exploit likelihood

47%

Patch ETA

—

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.

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OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Mixed 8 releases

Version	Status	Fixed in
trixie	Fixed	`1:8.9p1-1`
sid	Fixed	`1:8.9p1-1`
forky	Fixed	`1:8.9p1-1`
bullseye	Affected	—
bookworm	Fixed	`1:8.9p1-1`
11.0	Affected	—
10.0	Affected	—
9.0	Affected	—

Application impact

Vendor	Product	Versions	Fixed
openbsd	openssh	`{"endExcluding":"8.9"}`	`8.9`

References

CWEs

CWE-287

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

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