How severe is CVE-2019-9717?

CVE-2019-9717 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-9717 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9717?

CVE-2019-9717 affects Libav. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9717?

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

When was CVE-2019-9717 published?

CVE-2019-9717 was published on 2019-09-19 and last updated on 2026-06-17.

CVE-2019-9717

CVE-2019-9717 is a medium-severity vulnerability in Libav with a CVSS 3.x base score of 6.5. 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-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 7.1
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Libav
Published: 2019-09-19
Last modified: 2026-06-17

Description

In Libav 12.3, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c has a complex format argument to sscanf.

Frequently asked questions

What is CVE-2019-9717?: In Libav 12.3, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c has a complex format argument to sscanf.
How severe is CVE-2019-9717?: CVE-2019-9717 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-9717 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9717?: CVE-2019-9717 affects Libav. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9717?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-9717 published?: CVE-2019-9717 was published on 2019-09-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libav:libav:*:*:*:*:*:*:*:*

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CVE-2012-2804 — Critical (CVSS 10.0): Unspecified vulnerability in libavcodec/indeo3.c in FFmpeg before 0.11 and Libav 0.8.x before 0.8.5 has unknown impact…
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