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CVE-2023-34108

25
FAUCET Score

CVE-2023-34108 is a high-severity vulnerability in mailcow, a mail server suite, that allows an authenticated attacker to manipulate internal Dovecot variables. By crafting a specially formatted password, an attacker can inject key-value pairs that Dovecot interprets, leading to unintended consequences. This vulnerability has a CVSS score of 8.8 (High) due to its network attack vector, low attack complexity, and potential for high impact on confidentiality, integrity, and availability. While there are no known active exploits, public exploit code, or significant community discussion, users are strongly advised to upgrade to mailcow version 2023-05a to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2023-05CPE matchmatch criteria
cpe:2.3:a:mailcow:mailcow\:_dockerized:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.98%
Probability of exploitation in next 30 days
EPSS Percentile
58.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0098 is in the 54th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / mailcow/mailcow-dockerized/commit/f80940efdccd393bf5fccec2886795372a38c445
Patch
github.com / mailcow/mailcow-dockerized/security/advisories/GHSA-mhh4-qchc-pv22
Vendor Advisory
github.com / VladimirBorisov/CVE_proposal/blob/main/MailcowUserPassword.md
Product