CVE-2015-8313

GnuTLS incorrectly validates the first byte of padding in CBC modes

5.9 MediumFix available

GnuTLS incorrectly validates the first byte of padding in CBC modes

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

1.69%Up 0.6 points since Feb 4, 2022

What each source reports

NVD Score used 5.9

GnuTLS incorrectly validates the first byte of padding in CBC modes

Record: CVE-2015-8313
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:P/I:N/A:N
Weakness: CWE-203
Updated: 2026-11-02

CVE List No score

GnuTLS incorrectly validates the first byte of padding in CBC modes

Record: CVE-2015-8313
Updated: 2026-11-02

EUVDEUVD-2015-8199 No score

GnuTLS incorrectly validates the first byte of padding in CBC modes

Record: EUVD-2015-8199
Updated: 2026-11-03

GitHub AdvisoriesGHSA-p72h-2892-8mjc 5.9

GnuTLS incorrectly validates the first byte of padding in CBC modes

GnuTLS incorrectly validates the first byte of padding in CBC modes

Record: GHSA-p72h-2892-8mjc
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-203
Updated: 2026-11-02

OSVUBUNTU-CVE-2015-8313 5.9

GnuTLS incorrectly validates the first byte of padding in CBC modes

Record: UBUNTU-CVE-2015-8313
CVSS 3.1: 5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVSUSE-SU-2016:0077-1 No score

Security update for gnutls

This update for gnutls fixes the following security issues:

CVE-2015-8313: First byte of the padding in CBC mode is not checked (bsc#957568)
CVE-2015-2806: Two-byte stack overflow in asn1_der_decoding (bsc#924828)

Record: SUSE-SU-2016:0077-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`gnutls26` Debian:6.0	before 2.8.6-1+squeeze6, plus listed versions 2.8.6-12.8.6-1+squeeze12.8.6-1+squeeze22.8.6-1+squeeze32.8.6-1+squeeze42.8.6-1+squeeze5	2.8.6-1+squeeze6
`gnutls26` Debian:7	before 2.12.20-8+deb7u4, plus listed versions 2.12.20-62.12.20-72.12.20-82.12.20-8+deb7u12.12.20-8+deb7u22.12.20-8+deb7u3	2.12.20-8+deb7u4
`gnutls` SUSE:Linux Enterprise Software Development Kit 11 SP3 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Software Development Kit 11 SP4 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Desktop 11 SP3 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Desktop 11 SP4 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise High Availability Extension 11 SP3 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise High Availability Extension 11 SP4 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Server 11 SP3 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Server 11 SP3-TERADATA From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1

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Affected packages
Package	Affected	Fixed
`gnutls` SUSE:Linux Enterprise Server for SAP Applications 11 SP3 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Server 11 SP4 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls` SUSE:Linux Enterprise Server for SAP Applications 11 SP4 From an advisory covering 2 CVEs	before 2.4.1-24.39.60.1	2.4.1-24.39.60.1
`gnutls26` Ubuntu:14.04:LTS	before 2.12.23-12ubuntu2.3, plus listed versions 2.12.23-1ubuntu42.12.23-1ubuntu52.12.23-12ubuntu12.12.23-12ubuntu22.12.23-12ubuntu2.12.12.23-12ubuntu2.2	2.12.23-12ubuntu2.3

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-8313 is a medium vulnerability (CVSS 5.9) in Gnu Gnutls, published November 30, 2015. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.69%, the 77th percentile. Fixed in gnutls26 2.8.6-1+squeeze6.

References

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