Is CVE-2017-6891 in the CISA KEV catalog?

No. CVE-2017-6891 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-6891?

CVE-2017-6891 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2017-6891?

CVE-2017-6891 has an EPSS score of 5.58% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-6891?

Upgrade libtasn1-6 on debian 11 to 4.10-1.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2017-6891

HIGHEPSS 92th pctl

8.8

CVSS v3

NVD

Description

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.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

libtasn1-6Debian

Fixed in:4.10-1.1CVE-2017-6891

libtasn1-6Ubuntu

Fixed in:3.4-3ubuntu0.5USN-3309-1

Fixed in:4.7-3ubuntu0.16.04.2USN-3309-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

5.58%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

secuniaresearch.flexerasoftware.com

Third-Party Advisory4

Other references5

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.