How severe is CVE-2021-45429?

CVE-2021-45429 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-45429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45429?

CVE-2021-45429 affects Virustotal Yara. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45429?

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

When was CVE-2021-45429 published?

CVE-2021-45429 was published on 2022-02-04 and last updated on 2026-06-17.

CVE-2021-45429

CVE-2021-45429 is a medium-severity vulnerability in Virustotal Yara 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-120.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Virustotal Yara
Published: 2022-02-04
Last modified: 2026-06-17

Description

A Buffer Overflow vulnerablity exists in VirusTotal YARA git commit: 605b2edf07ed8eb9a2c61ba22eb2e7c362f47ba7 via yr_set_configuration in yara/libyara/libyara.c, which could cause a Denial of Service.

Frequently asked questions

What is CVE-2021-45429?: A Buffer Overflow vulnerablity exists in VirusTotal YARA git commit: 605b2edf07ed8eb9a2c61ba22eb2e7c362f47ba7 via yr_set_configuration in yara/libyara/libyara.c, which could cause a Denial of Service.
How severe is CVE-2021-45429?: CVE-2021-45429 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-45429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45429?: CVE-2021-45429 affects Virustotal Yara. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45429?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-45429 published?: CVE-2021-45429 was published on 2022-02-04 and last updated on 2026-06-17.

References

https://github.com/VirusTotal/yara/issues/1616

Affected products (1)

cpe:2.3:a:virustotal:yara:*:*:*:*:*:*:*:*

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