How severe is CVE-2017-9051?

CVE-2017-9051 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-9051 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9051?

CVE-2017-9051 affects Libav. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9051?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-9051 published?

CVE-2017-9051 was published on 2017-05-18 and last updated on 2026-06-17.

CVE-2017-9051

CVE-2017-9051 is a critical-severity vulnerability in Libav with a CVSS 3.x base score of 9.8. 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-476.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Libav
Published: 2017-05-18
Last modified: 2026-06-17

Description

libav before 12.1 is vulnerable to an invalid read of size 1 due to NULL pointer dereferencing in the nsv_read_chunk function in libavformat/nsvdec.c.

Frequently asked questions

What is CVE-2017-9051?: libav before 12.1 is vulnerable to an invalid read of size 1 due to NULL pointer dereferencing in the nsv_read_chunk function in libavformat/nsvdec.c.
How severe is CVE-2017-9051?: CVE-2017-9051 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-9051 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9051?: CVE-2017-9051 affects Libav. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9051?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-9051 published?: CVE-2017-9051 was published on 2017-05-18 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Libav

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CVE-2012-2803 — Critical (CVSS 10.0): Double free vulnerability in the mpeg_decode_frame function in libavcodec/mpeg12.c in FFmpeg before 0.11, and Libav…
CVE-2012-2802 — Critical (CVSS 10.0): Unspecified vulnerability in the ac3_decode_frame function in libavcodec/ac3dec.c in FFmpeg before 0.11 and Libav 0.8.x…

All CVEs affecting Libav →

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Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →