How severe is CVE-2015-8791?

CVE-2015-8791 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2015-8791 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-8791?

CVE-2015-8791 affects Matroska Libebml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-8791?

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

When was CVE-2015-8791 published?

CVE-2015-8791 was published on 2016-01-29 and last updated on 2026-06-17.

CVE-2015-8791

CVE-2015-8791 is a medium-severity vulnerability in Matroska Libebml with a CVSS 3.x base score of 4.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Matroska Libebml
Published: 2016-01-29
Last modified: 2026-06-17

Description

The EbmlElement::ReadCodedSizeValue function in libEBML before 1.3.3 allows context-dependent attackers to obtain sensitive information from process heap memory via a crafted length value in an EBML id, which triggers an invalid memory access.

Frequently asked questions

What is CVE-2015-8791?: The EbmlElement::ReadCodedSizeValue function in libEBML before 1.3.3 allows context-dependent attackers to obtain sensitive information from process heap memory via a crafted length value in an EBML id, which triggers an invalid memory access.
How severe is CVE-2015-8791?: CVE-2015-8791 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2015-8791 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-8791?: CVE-2015-8791 affects Matroska Libebml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-8791?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-8791 published?: CVE-2015-8791 was published on 2016-01-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:matroska:libebml:*:*:*:*:*:*:*:*

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