CVE-2020-21674

6.5 mediumEPSS 2.1%

Medium (6.5) in libarchive libarchive. EPSS 2.1% chance of exploitation in the next 30 days.

Heap-based buffer overflow in archive_string_append_from_wcs() (archive_string.c) in libarchive-3.4.1dev allows remote attackers to cause a denial of service (out-of-bounds write in heap memory resulting into a crash) via a crafted archive file. NOTE: this only affects users who downloaded the development code from GitHub. Users of the product's official releases are unaffected.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS: 2.1% chance of exploitation in the next 30 days; higher than 81% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2020-10-15
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

libarchive:libarchive

References

https://github.com/libarchive/libarchive/commit/4f085eea879e2be745f4d9bf57e8513ae48157f4
https://github.com/libarchive/libarchive/issues/1298
https://github.com/libarchive/libarchive/commit/4f085eea879e2be745f4d9bf57e8513ae48157f4
https://github.com/libarchive/libarchive/issues/1298

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