CVE catalog

CVE-2015-6806

screen: CVE-2015-6806

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: Sep 4, 2015, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 4.15% · Oct 25, 2026

The MScrollV function in ansi.c in GNU screen 4.3.1 and earlier does not properly limit recursion, which allows remote attackers to cause a denial of service (stack consumption) via an escape sequence with a large repeat count value.

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	screen	sid	`5.0.2-1`	fixed
Debian	screen	forky	`5.0.2-1`	fixed
Debian	screen	trixie	`4.9.1-3`	fixed
Debian	screen	bookworm	`4.9.0-4`	fixed
Ubuntu	screen	pro	`4.0.3-14ubuntu10`	vulnerable
Ubuntu	screen	pro	`4.1.0~20120320gitdb59704-9`	vulnerable
Ubuntu	screen	pro	`4.1.0~20120320gitdb59704-9ubuntu0.1~esm1`	fixed
Suse	screen	linux enterprise desktop 12 sp3	`4.0.4-23.3.3`	fixed
Suse	screen	linux enterprise desktop 12 sp4	`4.0.4-23.3.3`	fixed
Suse	screen	linux enterprise server 12 sp3	`4.0.4-23.3.3`	fixed
Suse	screen	linux enterprise server for sap applications 12 sp3	`4.0.4-23.3.3`	fixed
Suse	screen	linux enterprise server 12 sp4	`4.0.4-23.3.3`	fixed
Suse	screen	linux enterprise server for sap applications 12 sp4	`4.0.4-23.3.3`	fixed
Ubuntu	screen	pro	`4.0.3-14ubuntu10`	vulnerable
Ubuntu	screen	pro	`4.1.0~20120320gitdb59704-9`	vulnerable
Ubuntu	screen	pro	`4.1.0~20120320gitdb59704-9ubuntu0.1~esm1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	screen	source	sid	`4.3.1-2`	not yet assigned	Not reported	[797624]
Debian	screen	source	forky	`4.3.1-2`	not yet assigned	Not reported	[797624]
Debian	screen	source	trixie	`4.3.1-2`	not yet assigned	Not reported	[797624]
Debian	screen	source	bookworm	`4.3.1-2`	not yet assigned	Not reported	[797624]
Ubuntu	screen	deb	pro	`4.1.0~20120320gitdb59704-9ubuntu0.1~esm1`	Not reported	USN-3996-1	Not reported
Suse	screen	rpm	linux enterprise desktop 12 sp3	`4.0.4-23.3.3`	Not reported	SUSE-SU-2019:1354-1	Not reported
Suse	screen	rpm	linux enterprise desktop 12 sp4	`4.0.4-23.3.3`	Not reported	SUSE-SU-2019:1354-1	Not reported
Suse	screen	rpm	linux enterprise server 12 sp3	`4.0.4-23.3.3`	Not reported	SUSE-SU-2019:1354-1	Not reported
Suse	screen	rpm	linux enterprise server for sap applications 12 sp3	`4.0.4-23.3.3`	Not reported	SUSE-SU-2019:1354-1	Not reported
Suse	screen	rpm	linux enterprise server 12 sp4	`4.0.4-23.3.3`	Not reported	SUSE-SU-2019:1354-1	Not reported
Suse	screen	rpm	linux enterprise server for sap applications 12 sp4	`4.0.4-23.3.3`	Not reported	SUSE-SU-2019:1354-1	Not reported
Ubuntu	screen	deb	pro	`4.1.0~20120320gitdb59704-9ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2015-6806	Not reported

[Debian bug #797624]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[screen]Fixed
Details (2)
- 4.9.0-4 · amd64 · bookworm
  Fixed · Fixed: 4.3.1-2
  dsa · screen · debian · bookworm; dsa · screen · debian · 12
- 4.9.0-4 · arm64 · bookworm
  Fixed · Fixed: 4.3.1-2
  dsa · screen · debian · bookworm; dsa · screen · debian · 12

[Debian 13 (Trixie)]

[screen]Fixed
Details (2)
- 4.9.1-3 · amd64 · trixie
  Fixed · Fixed: 4.3.1-2
  dsa · screen · debian · 13
- 4.9.1-3 · arm64 · trixie
  Fixed · Fixed: 4.3.1-2
  dsa · screen · debian · 13

Observed: Oct 23, 2026, 5:16:07 PM UTC

References

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