CVE-2021-37845

Severity: low (CVSS 3.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-05-29 · updated 2026-06-17

Description

An issue was discovered in Citadel through webcit-932. A meddler-in-the-middle attacker can fixate their own session during the cleartext phase before a STARTTLS command (a violation of "The STARTTLS command is only valid in non-authenticated state." in RFC2595). This potentially allows an attacker to cause a victim's e-mail messages to be stored into an attacker's IMAP mailbox, but depends on details of the victim's client behavior.

Affected products

Citadel Webcit: through 932

References

http://uncensored.citadel.org/dotgoto?room=Citadel%20Security
https://nostarttls.secvuln.info/
https://uncensored.citadel.org/msg/2099264259
http://uncensored.citadel.org/dotgoto?room=Citadel%20Security
https://nostarttls.secvuln.info/
https://uncensored.citadel.org/msg/2099264259

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