What’s Vulnerable › Vulnerabilities

CVE-2021-46853

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-11-03 · updated 2026-06-17
• Weakness: CWE-367

Description

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

Affected products

• stevespringett alpine: before 2.25 — fixed in 2.25

How to fix

Upgrade to a fixed version: stevespringett alpine 2.25. Check the vendor advisory for mitigations.

References

• https://bugs.gentoo.org/807613
• https://nostarttls.secvuln.info/
• https://security.gentoo.org/glsa/202301-07
• https://bugs.gentoo.org/807613
• https://nostarttls.secvuln.info/
• https://security.gentoo.org/glsa/202301-07

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