CVE-2021-46853
Alpine before 2.25 allows remote attackers to cause a denial of service (daemon crash) when LIST...
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
- Record
CVE-2021-46853- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-367
- Updated
- 2026-11-02
CVE List
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
- Record
CVE-2021-46853- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-367
- Updated
- 2026-11-02
EUVDEUVD-2021-33507
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
- Record
EUVD-2021-33507- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-v9q2-jxcm-rm4c
Alpine before 2.25 allows remote attackers to cause a denial of service (daemon crash) when LIST...
Alpine before 2.25 allows remote attackers to cause a denial of service (daemon crash) when LIST or LSUB is sent before STARTTLS.
- Record
GHSA-v9q2-jxcm-rm4c- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-367
- Updated
- 2026-11-02
OSV
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
- Record
CVE-2021-46853- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-46853
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
- Record
DEBIAN-CVE-2021-46853- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-46853
Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.
- Record
UBUNTU-CVE-2021-46853- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUSN-7360-1 No score
alpine vulnerabilities
It was discovered that Alpine did not use a secure connection under certain circumstances. A remote attacker could possibly use this issue to leak sensitive information. (CVE-2020-14929)
It was discovered that Alpine could allow untagged responses from an IMAP server before upgrading to a TLS connection. A remote attacker could possibly use this issue to leak sensitive information. (CVE-2021-38370)
It was discovered that Alpine could crash when receiving certain SMTP commands. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2021-46853)
- Record
USN-7360-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
alpineDebian:12 |
before 2.25+dfsg1-1 | 2.25+dfsg1-1 |
alpineDebian:13 |
before 2.25+dfsg1-1 | 2.25+dfsg1-1 |
alpineDebian:14 |
before 2.25+dfsg1-1 | 2.25+dfsg1-1 |
alpineUbuntu:Pro:16.04:LTS |
before 2.20+dfsg1-2ubuntu0.1~esm1, plus listed versions 2.20+dfsg1-12.20+dfsg1-2 |
2.20+dfsg1-2ubuntu0.1~esm1 |
alpineUbuntu:Pro:18.04:LTS |
before 2.21+dfsg1-1ubuntu0.1~esm1, plus listed versions 2.20+dfsg1-72.21+dfsg1-12.21+dfsg1-1build1 |
2.21+dfsg1-1ubuntu0.1~esm1 |
alpineUbuntu:Pro:20.04:LTS |
before 2.22+dfsg1-1ubuntu0.1~esm1, plus listed versions 2.21+dfsg1-1.1build12.22+dfsg1-1 |
2.22+dfsg1-1ubuntu0.1~esm1 |
alpineUbuntu:Pro:16.04:LTS From an advisory covering 3 CVEs |
before 2.20+dfsg1-2ubuntu0.1~esm1, plus listed versions 2.20+dfsg1-12.20+dfsg1-2 |
2.20+dfsg1-2ubuntu0.1~esm1 |
alpineUbuntu:Pro:18.04:LTS From an advisory covering 3 CVEs |
before 2.21+dfsg1-1ubuntu0.1~esm1, plus listed versions 2.20+dfsg1-72.21+dfsg1-12.21+dfsg1-1build1 |
2.21+dfsg1-1ubuntu0.1~esm1 |
alpineUbuntu:Pro:20.04:LTS From an advisory covering 3 CVEs |
before 2.22+dfsg1-1ubuntu0.1~esm1, plus listed versions 2.21+dfsg1-1.1build12.22+dfsg1-1 |
2.22+dfsg1-1ubuntu0.1~esm1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-46853 is a medium vulnerability (CVSS 5.9) in Alpine Project Alpine, published November 3, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.15%, the 66th percentile. Fixed in alpine 2.25+dfsg1-1.