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CVE-2016-7970

27
FAUCET Score

CVE-2016-7970 describes a buffer overflow vulnerability in the `calc_coeff` function of libass versions prior to 0.13.4, impacting products like Fedora and libass_project. This flaw allows remote attackers to trigger a denial of service. With a CVSS score of 7.5 (High), it can be exploited over the network with low attack complexity, requiring no user interaction or privileges, and leading to high availability impact. Despite its severity, there is no evidence of active exploitation, no publicly available exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
23CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
24CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
25CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*
<= 0.13.3CPE matchmatch criteria
cpe:2.3:a:libass_project:libass:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.75%
Probability of exploitation in next 30 days
EPSS Percentile
90.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0475 is in the 84th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

gentoopatch availablevia nvd_reference
View patch
github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia nvd_reference
View patch

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatch
github.com / libass/libass/pull/240/commits/08e754612019ed84d1db0d1fc4f5798248decd75
Issue TrackingPatchThird Party Advisory
github.com / libass/libass/releases/tag/0.13.4
PatchRelease NotesThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/KW6DNERYHPI5Y6SQYU3XKTVSCOWMIHUC
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/R7JJ2SGVOX6UQQIRMVC3QACJLKHE2PYN
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/VUOUOK3VULMMZTNSCRFCNPDAPDWAVK7X
security.gentoo.org / glsa/201702-25
PatchThird Party AdvisoryVDB Entry
openwall.com / lists/oss-security/2016/10/05/2
Mailing ListPatchThird Party Advisory
securityfocus.com / bid/93358
Third Party AdvisoryVDB Entry