How severe is CVE-2017-12801?

CVE-2017-12801 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-2017-12801 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12801?

CVE-2017-12801 primarily affects Matroska Libebml2. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-12801?

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

When was CVE-2017-12801 published?

CVE-2017-12801 was published on 2017-11-10 and last updated on 2026-06-17.

CVE-2017-12801

CVE-2017-12801 is a medium-severity vulnerability in Matroska Libebml2 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Matroska Libebml2
Published: 2017-11-10
Last modified: 2026-06-17

Description

The UpdateDataSize function in ebmlmaster.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial of service (assert fault) via a crafted mkv file.

Frequently asked questions

What is CVE-2017-12801?: The UpdateDataSize function in ebmlmaster.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial of service (assert fault) via a crafted mkv file.
How severe is CVE-2017-12801?: CVE-2017-12801 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-2017-12801 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12801?: CVE-2017-12801 primarily affects Matroska Libebml2. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-12801?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-12801 published?: CVE-2017-12801 was published on 2017-11-10 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:matroska:libebml2:*:*:*:*:*:*:*:*
cpe:2.3:a:matroska:mkclean:0.8.9:*:*:*:*:*:*:*
cpe:2.3:a:matroska:mkvalidator:0.5.1:*:*:*:*:*:*:*

More vulnerabilities in Matroska Libebml2

CVE-2017-12802 — Medium (CVSS 6.5): The EBML_IntegerValue function in ebmlnumber.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial…
CVE-2017-12800 — Medium (CVSS 6.5): The EBML_FindNextElement function in ebmlmain.c in libebml2 through 2012-08-26 allows remote attackers to cause a…
CVE-2017-12783 — Medium (CVSS 6.5): The ReadDataFloat function in ebmlnumber.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial of…
CVE-2017-12782 — Medium (CVSS 6.5): The ReadData function in ebmlmaster.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial of…
CVE-2017-12781 — Medium (CVSS 6.5): The EBML_BufferToID function in ebmlelement.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial…
CVE-2017-12780 — Medium (CVSS 6.5): The ReadData function in ebmlstring.c in libebml2 through 2012-08-26 allows remote attackers to cause a denial of…

All CVEs affecting Matroska Libebml2 →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →