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CVE-2016-4008

31
FAUCET Score

CVE-2016-4008 is a denial-of-service vulnerability in the _asn1_extract_der_octet function of GNU Libtasn1 versions prior to 4.8, affecting products like Canonical, Fedora, and OpenSUSE. An attacker can trigger infinite recursion via a crafted certificate when the ASN1_DECODE_FLAG_STRICT_DER flag is not used. This vulnerability has a CVSSv3 score of 5.9 (Medium), indicating a network-based attack with high complexity and high impact on availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
15.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
29.57%
Probability of exploitation in next 30 days
EPSS Percentile
98.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.2957 is in the 98th percentile among its peer group of 19,954 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (4)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: gnutls
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libtasn1
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libtasn1
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Virtualization 3Fixed in: mingw-virt-viewer

Vendor Advisories (1)

redhatCVE-2016-4008Moderate

libtasn1: infinite loop while parsing DER certificates

Apr 11, 2016

References

git.savannah.gnu.org / gitweb
git.savannah.gnu.org / gitweb
lists.fedoraproject.org / pipermail/package-announce/2016-April/182299.html
lists.fedoraproject.org / pipermail/package-announce/2016-April/182907.html
lists.fedoraproject.org / pipermail/package-announce/2016-April/183221.html
lists.opensuse.org / opensuse-updates/2016-06/msg00047.html
lists.opensuse.org / opensuse-updates/2016-06/msg00097.html
lists.gnu.org / archive/html/help-libtasn1/2016-04/msg00009.html
security.gentoo.org / glsa/201703-05
debian.org / security/2016/dsa-3568
openwall.com / lists/oss-security/2016/04/11/3
ubuntu.com / usn/USN-2957-1
ubuntu.com / usn/USN-2957-2