CVE-2019-9720

MEDIUMNVD 6.56.5—

6.5

A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 52.9%
KEV: Not listed

Published

September 19, 2019

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L161
cve@mitrehttps://lgtm.com/security/
af854a3a-2127-422b-91ae-364da2661108https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L161
af854a3a-2127-422b-91ae-364da2661108https://lgtm.com/security/

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 14:23 UTCEG score recompute
2026-05-27 14:23 UTCGHSA enrichment
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:47 UTCepss_batch

Frequently asked(5)

What is CVE-2019-9720?

CVE-2019-9720 is a medium vulnerability published on September 19, 2019. A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srttoass in libavcodec/srtdec.c misuses snprintf.

When was CVE-2019-9720 disclosed?

CVE-2019-9720 was first published in the National Vulnerability Database on September 19, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-9720 actively exploited?

CVE-2019-9720 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-9720?

CVE-2019-9720 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2019-9720?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9720, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2019-9720

📅 Published

🔄 Last Modified

🔗 References (4)