CVE-2021-37845
lowpriority · track · 15OT risk · elevatedEPSS 0.007 · 52 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- http://uncensored.citadel.org/dotgoto?room=Citadel%20Securitycnnvd
- https://cxsecurity.com/cveshow/CVE-2021-37845/cnnvd
- https://nostarttls.secvuln.info/cnnvd
- https://uncensored.citadel.org/msg/2099264259cnnvd
- http://uncensored.citadel.org/dotgoto?room=Citadel%20Securityenisa_euvd
- https://nostarttls.secvuln.info/enisa_euvd
- https://uncensored.citadel.org/msg/2099264259enisa_euvd
- http://uncensored.citadel.org/dotgoto?room=Citadel%20SecurityIssue Trackingnvd
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