How severe is CVE-2017-13666?

CVE-2017-13666 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-13666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-13666?

CVE-2017-13666 primarily affects Multicorewareinc X265. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-13666?

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

When was CVE-2017-13666 published?

CVE-2017-13666 was published on 2017-08-24 and last updated on 2026-06-17.

CVE-2017-13666

CVE-2017-13666 is a medium-severity vulnerability in Multicorewareinc X265 with a CVSS 3.x base score of 5.5. 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-191.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Multicorewareinc X265
Published: 2017-08-24
Last modified: 2026-06-17

Description

An integer underflow vulnerability exists in pixel-a.asm, the x86 assembly code for planeClipAndMax() in MulticoreWare x265 through 2.5, as used in libbpg and other products. A small height value can cause an integer underflow, which leads to a crash. This is a different vulnerability than CVE-2017-8906.

Frequently asked questions

What is CVE-2017-13666?: An integer underflow vulnerability exists in pixel-a.asm, the x86 assembly code for planeClipAndMax() in MulticoreWare x265 through 2.5, as used in libbpg and other products. A small height value can cause an integer underflow, which leads to a crash. This is a different vulnerability than CVE-2017-8906.
How severe is CVE-2017-13666?: CVE-2017-13666 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-13666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-13666?: CVE-2017-13666 primarily affects Multicorewareinc X265. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-13666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-13666 published?: CVE-2017-13666 was published on 2017-08-24 and last updated on 2026-06-17.

References

https://bitbucket.org/multicoreware/x265/issues/364/integer-overflow-and-affect-top-level

Affected products (26)

cpe:2.3:a:multicorewareinc:x265:0.1:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.2:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.3:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.4:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.4.1:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.5:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.6:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.7:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.8:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:0.9:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.1:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.2:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.3:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.4:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.5:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.6:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.7:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.8:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:1.9:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:2.0:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:2.1:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:2.2:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:2.3:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:2.4:*:*:*:*:*:*:*
cpe:2.3:a:multicorewareinc:x265:2.5:*:*:*:*:*:*:*

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