VIR Vulnerability Intelligence Relay

CVE-2026-33603

medium
Published 2026-05-12 · Modified 2026-05-18
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
5.3
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4 NEW
—
not yet in upstream
VIR risk
5.3

Description

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.

Predictions

Exploit likelihood
53%
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.

✚ 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
OSVersionStatusFixed in
debian debianbookwormaffected
debian debianbullseyeaffected
debian debianforkyfixed1:2.4.4+dfsg1-1
debian debiansidfixed1:2.4.4+dfsg1-1
debian debiantrixieaffected
suse slesaffected

Application impact
VendorProductVersionsFixed
dovecotdovecot{"endExcluding":"2.4.4"}2.4.4
open-xchangedovecot{"endExcluding":"3.1.5"}3.1.5

References

CWEs

CWE-99

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

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