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Fencer Vulns
high 8.8

CVE-2017-6891 json

Two errors in the "asn1_find_node()" function (lib/parser_aux.c) within GnuTLS libtasn1 version 4.10 can be exploited to cause a stacked-ba…

published 2017-05-22 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-15945

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.6%
EPSS 5.6% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

Two errors in the "asn1_find_node()" function (lib/parser_aux.c) within GnuTLS libtasn1 version 4.10 can be exploited to cause a stacked-based buffer overflow by tricking a user into processing a specially crafted assignments file via the e.g. asn1Coding utility.

Patch / fix

  • libtasn1-6 Debian 14, Debian 13, Debian 12 4.10-1.1

debian advisories DEBIAN-CVE-2017-6891

  • libtasn1-6 Ubuntu 14.04 LTS 3.4-3ubuntu0.5
  • libtasn1-6 Ubuntu 16.04 LTS 4.7-3ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2017-6891

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

  • libtasn1 SLES 12 SP2-BCL 3.7-13.7.1
  • libtasn1 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4 +5 more 4.9-3.10.1
  • gnutls SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 +1 more 2.4.1-24.39.70.1

suse advisories SUSE-SU-2022:3797-1SUSE-SU-2019:1379-1SUSE-SU-2017:1886-1

  • libtasn1 Alpine 3.3 4.7-r2
  • libtasn1 Alpine 3.4 4.8-r1
  • libtasn1 Alpine 3.5 4.9-r1
  • libtasn1 Alpine 3.6 4.10-r1

alpine advisories ALPINE-CVE-2017-6891

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libtasn1 Arch Linux 4.11-1
  • lib32-libtasn1 Arch Linux 4.11-1

arch linux advisories AVG-285AVG-286

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-2017-6891 updated cvss 7.8

libtasn1: Stack-based buffer overflow in asn1_find_node()

  • Red Hat Enterprise Linux 6 libtasn1, libtasn1-tools Red Hat Enterprise Linux 7 libtasn1, libtasn1-tools Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer Red Hat Satellite 6 libtasn1
    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

5.58% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Flexera Software LLC GnuTLS libtasn1

Classification

Weakness

References

Sources

Fencer Vulns 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.