CVE-2016-6313

Summary

CVE	CVE-2016-6313
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2016-12-13 20:59:04 UTC
Updated	2026-05-06 22:30:45 UTC
Description	The mixing functions in the random number generator in Libgcrypt before 1.5.6, 1.6.x before 1.6.6, and 1.7.x before 1.7.3 and GnuPG before 1.4.21 make it easier for attackers to obtain the values of 160 bits by leveraging knowledge of the previous 4640 bits.

Risk And Classification

Primary CVSS: v3.0 5.3 MEDIUM from [email protected]

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

EPSS: 0.031770000 probability, percentile 0.870500000 (date 2026-05-11)

Problem Types: CWE-200 | n/a

Version	Source	Type	Score	Severity	Vector
3.0	[email protected]	Primary	5.3	MEDIUM	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`
2.0	[email protected]	Primary	5		`AV:N/AC:L/Au:N/C:P/I:N/A:N`

CVSS v3.0 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

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

CVSS v2.0 Breakdown

Access Vector

Network

Access Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

AV:N/AC:L/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Canonical	Ubuntu Linux	12.04	All	All	All
Operating System	Canonical	Ubuntu Linux	14.04	All	All	All
Operating System	Canonical	Ubuntu Linux	16.04	All	All	All
Operating System	Debian	Debian Linux	8.0	All	All	All
Application	Gnupg	Gnupg	All	All	All	All
Application	Gnupg	Libgcrypt	1.6.0	All	All	All
Application	Gnupg	Libgcrypt	1.6.1	All	All	All
Application	Gnupg	Libgcrypt	1.6.2	All	All	All
Application	Gnupg	Libgcrypt	1.6.3	All	All	All
Application	Gnupg	Libgcrypt	1.6.4	All	All	All
Application	Gnupg	Libgcrypt	1.6.5	All	All	All
Application	Gnupg	Libgcrypt	1.7.0	All	All	All
Application	Gnupg	Libgcrypt	1.7.1	All	All	All
Application	Gnupg	Libgcrypt	1.7.2	All	All	All
Application	Gnupg	Libgcrypt	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Na	N/a	affected n/a	Not specified

References

Reference	Source	Link	Tags
GnuPG and Libgcrypt CVE-2016-6313 Local Predictable Random Number Generator Weakness	af854a3a-2127-422b-91ae-364da2661108	www.securityfocus.com	Third Party Advisory, VDB Entry
USN-3065-1: Libgcrypt vulnerability \| Ubuntu	af854a3a-2127-422b-91ae-364da2661108	www.ubuntu.com	Third Party Advisory
Debian -- Security Information -- DSA-3649-1 gnupg	af854a3a-2127-422b-91ae-364da2661108	www.debian.org	Third Party Advisory
Debian -- Security Information -- DSA-3650-1 libgcrypt20	af854a3a-2127-422b-91ae-364da2661108	www.debian.org	Third Party Advisory
[Announce] Security fixes for Libgcrypt and GnuPG 1.4 [CVE-2016-6316]	af854a3a-2127-422b-91ae-364da2661108	lists.gnupg.org	Mailing List, Vendor Advisory
libgcrypt: Multiple vulnerabilities (GLSA 201610-04) — Gentoo Security	af854a3a-2127-422b-91ae-364da2661108	security.gentoo.org
Red Hat Customer Portal	af854a3a-2127-422b-91ae-364da2661108	rhn.redhat.com
GnuPG: RNG output is predictable (GLSA 201612-01) — Gentoo security	af854a3a-2127-422b-91ae-364da2661108	security.gentoo.org
git.gnupg.org Git	af854a3a-2127-422b-91ae-364da2661108	git.gnupg.org
GnuPG Flaw in Random Number Generator Mixing Functions Lets Users Predict Some Output - SecurityTracker	af854a3a-2127-422b-91ae-364da2661108	www.securitytracker.com
USN-3064-1: GnuPG vulnerability \| Ubuntu	af854a3a-2127-422b-91ae-364da2661108	www.ubuntu.com	Third Party Advisory
CONFIRM:https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=blob_plain;f=NEWS	MITRE	git.gnupg.org
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.