CVE catalog

CVE-2021-31855

kf5-messagelib: CVE-2021-31855

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Published: Jun 2, 2021, 4:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.61% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	kf5-messagelib	bookworm	`4:22.12.3-2~deb12u1`	fixed
Ubuntu	kdepim4	18.04	`4:4.14.10-7`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.04.3-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.04.3-0ubuntu2`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.08.3-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.08.3-0ubuntu2`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.12.2-0ubuntu3`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.12.3-0ubuntu2`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.12.3-0ubuntu3`	vulnerable
Ubuntu	kf5-messagelib	pro	`4:17.12.3-0ubuntu3+esm1`	vulnerable
Ubuntu	kf5-messagelib	20.04	`4:19.04.3-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	20.04	`4:19.04.3-0ubuntu2`	vulnerable
Ubuntu	kf5-messagelib	20.04	`4:19.12.3-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.08.1-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.08.3-0ubuntu2`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.11.80-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.11.90-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.12.0-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.12.1-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.12.2-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	22.04	`4:21.12.3-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.1-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.2-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.3-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.4-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.5-0ubuntu1`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.5-0ubuntu3`	vulnerable
Ubuntu	kf5-messagelib	24.04	`4:23.08.5-0ubuntu4`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	kf5-messagelib	source	bookworm	`4:20.08.3-5`	not yet assigned	Not reported	[989438]

[Debian bug #989438]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[kf5-messagelib-data]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · all · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · all · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messagecomposer5abi1]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messagecomposer-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messagecore5abi1]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messagecore-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messagelist5abi1]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messagelist-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messageviewer5abi1]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5messageviewer-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5mimetreeparser5abi1]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5mimetreeparser-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5templateparser5]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5templateparser-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5webengineviewer5abi1]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
[libkf5webengineviewer-dev]Fixed
Source package: [kf5-messagelib]
Details (2)
- 4:22.12.3-2~deb12u1 · amd64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12
- 4:22.12.3-2~deb12u1 · arm64 · bookworm
  Fixed · Fixed: 4:20.08.3-5
  dsa · kf5-messagelib · debian · bookworm; dsa · kf5-messagelib · debian · 12

Observed: Oct 23, 2026, 5:56:56 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]