CVE-2019-9720

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 47% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
61.5%
KEV
Not listed

Published

September 19, 2019

Last Modified

November 21, 2024

References (4)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-13 22:27 UTCEPSS rescore
  2. 2026-07-13 22:27 UTCEPSS rescore
  3. 2026-07-13 06:10 UTCEPSS rescore
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  16. 2026-07-05 02:27 UTCEPSS rescore
  17. 2026-07-04 06:28 UTCEPSS rescore
  18. 2026-07-02 22:35 UTCOSV refresh
  19. 2026-07-01 15:03 UTCEPSS rescore
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  21. 2026-06-29 14:03 UTCEPSS rescore
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  1. 2026-06-25 13:47 UTCEPSS rescore
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  19. 2026-06-15 17:46 UTCEPSS rescore
  20. 2026-06-14 23:15 UTCEPSS rescore
  21. 2026-06-14 23:15 UTCEPSS rescore
  22. 2026-06-14 18:13 UTCOSV refresh
  23. 2026-06-13 22:58 UTCEPSS rescore
  24. 2026-06-12 23:09 UTCEPSS rescore
  25. 2026-06-12 23:09 UTCEPSS rescore
  26. 2026-06-11 13:58 UTCEPSS rescore
  27. 2026-06-10 22:16 UTCEPSS rescore
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  41. 2026-06-02 20:11 UTCEPSS rescore
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  43. 2026-06-01 13:50 UTCEPSS rescore
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  45. 2026-05-31 22:29 UTCEPSS rescore
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  47. 2026-05-31 00:14 UTCEPSS rescore
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  49. 2026-05-29 13:42 UTCEPSS rescore
  50. 2026-05-28 13:43 UTCEPSS rescore
  51. 2026-05-28 13:43 UTCEPSS rescore
  52. 2026-05-27 14:23 UTCEG score recompute
  53. 2026-05-27 14:23 UTCGHSA enrichment
  54. 2026-05-27 13:39 UTCEPSS rescore
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  56. 2026-05-26 13:42 UTCEPSS rescore
  57. 2026-05-26 07:17 UTCEPSS rescore
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  59. 2026-05-26 07:17 UTCEPSS rescore
  60. 2026-05-24 16:47 UTCEPSS rescore

Related CVEs(same CWE)

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 61.5% 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.

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