How severe is CVE-2016-6313?

CVE-2016-6313 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2016-6313 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6313?

CVE-2016-6313 primarily affects Gnupg Libgcrypt. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6313?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-6313 published?

CVE-2016-6313 was published on 2016-12-13 and last updated on 2026-06-17.

CVE-2016-6313

CVE-2016-6313 is a medium-severity vulnerability in Gnupg Libgcrypt with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Gnupg Libgcrypt
Published: 2016-12-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2016-6313?: 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.
How severe is CVE-2016-6313?: CVE-2016-6313 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2016-6313 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6313?: CVE-2016-6313 primarily affects Gnupg Libgcrypt. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6313?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-6313 published?: CVE-2016-6313 was published on 2016-12-13 and last updated on 2026-06-17.

References

Affected products (15)

cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.6.0:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.6.1:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.6.2:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.6.3:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.6.4:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.6.5:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.7.0:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.7.1:*:*:*:*:*:*:*
cpe:2.3:a:gnupg:libgcrypt:1.7.2:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:a:gnupg:gnupg:*:*:*:*:*:*:*:*

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