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CVE-2021-38370

21
FAUCET Score

CVE-2021-38370 is a medium-severity vulnerability affecting Alpine before version 2.25, where untagged IMAP server responses are accepted prior to STARTTLS. This network-based vulnerability has high integrity impact and high attack complexity, allowing an attacker to potentially manipulate IMAP sessions. While no public exploits, Metasploit modules, or Nuclei templates are available, and it is not on the KEV catalog, there is also no community discussion or media coverage to indicate active exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.25CPE matchmatch criteria
cpe:2.3:a:alpine_project:alpine:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.57%
Probability of exploitation in next 30 days
EPSS Percentile
72.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0157 is in the 48th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

alpine.x10host.com
Release NotesThird Party Advisory
bugs.gentoo.org / 807613
Third Party Advisory
nostarttls.secvuln.info
ExploitThird Party Advisory
security.gentoo.org / glsa/202301-07
Third Party Advisory