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No exploitation reportedFix available

CVE-2021-31855

No exploitation reported by the sources we read.

  • Published2021-06-02
  • WeaknessCWE-312

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

KDE Messagelib through 5.17.0 reveals cleartext of encrypted messages in some situations. Deleting an attachment of a decrypted encrypted message stored on a remote server (e.g., an IMAP server) causes KMail to upload the decrypted content of the message to the remote server. With a crafted message, a user could be tricked into decrypting an encrypted message and then deleting an attachment attached to this message. If the attacker has access to the messages stored on the email server, then the attacker could read the decrypted content of the encrypted message. This occurs in ViewerPrivate::deleteAttachment in messageviewer/src/viewer/viewer_p.cpp.

Timeline

dates in UTC
  1. 2021-06-0216:15CVE publishedNVD

Versions per branch

NVD
Kde messagelib
BranchAffectedFixed in
5.17≤ 5.17.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kdepim4Ubuntu:18.04:LTSall versions · no fixed version listed
  • kf5-messagelibUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • kf5-messagelibUbuntu:24.04:LTSall versions · no fixed version listed
  • kf5-messagelibUbuntu:22.04:LTSall versions · no fixed version listed
  • kf5-messagelibUbuntu:20.04:LTSall versions · no fixed version listed
  • kf5-messagelibDebian:12all versions · fixed in 4:20.08.3-5
  • messagelibopenSUSE:Tumbleweedall versions · fixed in 21.08.1-1.2
  • messagelibMageia:8all versions · fixed in 20.12.0-1.1.mga8

1 more package range on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Published
2021-06-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-h76g-vp43-8cw5

Frequently asked questions

What is CVE-2021-31855?

KDE Messagelib through 5.17.0 reveals cleartext of encrypted messages in some situations. Deleting an attachment of a decrypted encrypted message stored on a remote server (e.g., an IMAP server) causes KMail to upload the decrypted content of the message to the remote server. With a crafted message, a user could be tricked into decrypting an encrypted message and then deleting an attachment attached to this message. If the attacker has access to the messages stored on the email server, then the attacker could read the decrypted content of the encrypted message. This occurs in ViewerPrivate::deleteAttachment in messageviewer/src/viewer/viewer_p.cpp.

Is CVE-2021-31855 actively exploited?

Active exploitation of CVE-2021-31855 has not been confirmed. Its EPSS score was 0.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31855?

CVE-2021-31855 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

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