Skip to content
Fencer Vulns
medium 5.9

CVE-2021-38370 json

In Alpine before 2.25, untagged responses from an IMAP server are accepted before STARTTLS.

published 2021-08-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24823

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

In Alpine before 2.25, untagged responses from an IMAP server are accepted before STARTTLS.

Patch / fix

  • alpine_project alpine 2.25
  • alpine Debian 14, Debian 13, Debian 12 2.25+dfsg1-1

debian advisories DEBIAN-CVE-2021-38370

  • alpine Ubuntu Pro 16.04 LTS 2.20+dfsg1-2ubuntu0.1~esm1
  • alpine Ubuntu Pro 18.04 LTS 2.21+dfsg1-1ubuntu0.1~esm1
  • alpine Ubuntu Pro 20.04 LTS 2.22+dfsg1-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-38370

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • alpine Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 2.25-r0

alpine advisories ALPINE-CVE-2021-38370

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

1.56% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-77 Improper Neutralization of Special Elements used in a Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.