Cyber Resilience

CVE-2021-36976

Medium

Published: 20 July 2021

Published
20 July 2021
Modified
03 November 2025
KEV Added
—
Patch
—
CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS Score 0.0019 41.0th percentile
Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-36976 is a medium-severity Use After Free (CWE-416) vulnerability in Splunk Universal Forwarder. Its CVSS base score is 6.5 (Medium).

Operationally, ranked at the 41.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

CWE(s)
CWE-416

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

libarchive
libarchive
3.4.1 — 3.5.2
fedoraproject
fedora
35
apple
ipados
≤ 15.4
apple
iphone os
≤ 15.4
apple
macos
≤ 12.3
apple
watchos
≤ 8.5
splunk
universal forwarder
9.1.0 · 8.2.0 — 8.2.12 · 9.0.0 — 9.0.6

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

References