CVE-2021-46853 — Time-of-check Time-of-use (TOCTOU) Race Condition in Project Alpine

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition6 documents5 sources
Severity
5.9MEDIUMNVD
OSV7.5
EPSS
0.3%
top 44.88%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Alpine Project AlpineDebian Alpine
Timeline
PublishedNov 3
Latest updateMar 20

Description

Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 2.2 | Impact: 3.6

Affected Packages4 packages

▶debiandebian/alpine< alpine 2.25+dfsg1-1 (bookworm)
▶Debianalpine_project/alpine< 2.25+dfsg1-1+2
▶Ubuntualpine_project/alpine< 2.20+dfsg1-2ubuntu0.1~esm1+2

🔴Vulnerability Details

3
OSV
alpine vulnerabilities↗2025-03-20
▶
GHSA
GHSA-v9q2-jxcm-rm4c: Alpine before 2↗2022-11-03
▶
OSV
CVE-2021-46853: Alpine before 2↗2022-11-03
▶

📋Vendor Advisories

2
Ubuntu
Alpine vulnerabilities↗2025-03-20
▶
Debian
CVE-2021-46853: alpine - Alpine before 2.25 allows remote attackers to cause a denial of service (applica...↗2021
▶