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Fencer Intel
medium 5.0

CVE-2015-6806 json

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…

published 2015-09-28 11 y ago modified 2026-06-17 4 mo ago also EUVD-2015-6743

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.1%
EPSS 4.1% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • screen Debian 14, Debian 13, Debian 12 4.3.1-2

debian advisories DEBIAN-CVE-2015-6806

  • screen Ubuntu Pro 14.04 LTS 4.1.0~20120320gitdb59704-9ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2015-6806

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • screen SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4 +3 more 4.0.4-23.3.3

suse advisories SUSE-SU-2019:1354-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-6806 updated cvss 3.5

screen: Stack overflow due to deep recursion causing process freeze

  • Red Hat Enterprise Linux 5 screen Red Hat Enterprise Linux 6 screen Red Hat Enterprise Linux 7 screen
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.15% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2015/09/03/11 referenced PoC, tagged "exploit" by a source, unverified
  • savannah.gnu.org https://savannah.gnu.org/bugs/?45713 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.