CVE-2021-33515 — Command Injection in Dovecot

CWE-77 — Command InjectionCWE-74 — Injection9 documents8 sources
Severity
4.8MEDIUMNVD
OSV5.5
EPSS
5.9%
top 9.42%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
DovecotDebian DovecotDebian Linux+2 more
Timeline
PublishedJun 28
Latest updateApr 18

Description

The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NExploitability: 2.2 | Impact: 2.5

Affected Packages5 packages

▶debiandebian/dovecot< dovecot 1:2.3.13+dfsg1-2 (bookworm)
▶NVDdovecot/dovecot< 2.3.14.1
▶Debiandovecot/dovecot< 1:2.3.13+dfsg1-2+3
▶Ubuntudovecot/dovecot< 1:2.3.7.2-1ubuntu3.4

Also affects: Debian Linux 10.0, Fedora 33, 34

🔴Vulnerability Details

4
GHSA
MailKit has STARTTLS Response Injection via unflushed stream buffer that enables SASL mechanism downgrade↗2026-04-18
▶
GHSA
GHSA-pwmq-cvcm-r5p2: The submission service in Dovecot before 2↗2022-05-24
▶
OSV
CVE-2021-33515: The submission service in Dovecot before 2↗2021-06-28
▶
OSV
dovecot vulnerabilities↗2021-06-21
▶

📋Vendor Advisories

4
Red Hat
dovecot: plaintext commands injection↗2021-06-21
▶
Ubuntu
Dovecot vulnerabilities↗2021-06-21
▶
Microsoft
The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.↗2021-06-08
▶
Debian
CVE-2021-33515: dovecot - The submission service in Dovecot before 2.3.15 allows STARTTLS command injectio...↗2021
▶