Cyber Resilience

CVE-2021-3516

HighPublic PoC

Published: 01 June 2021

Published
01 June 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0038 59.9th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-3516 is a high-severity Use After Free (CWE-416) vulnerability in Redhat Enterprise Linux. Its CVSS base score is 7.8 (High).

Operationally, ranked in the top 40.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and…

more

availability.

CWE(s)
CWE-416

Related Threats

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

Affected Assets

xmlsoft
xmllint
≤ 2.9.11
debian
debian linux
9.0
fedoraproject
fedora
33, 34
redhat
jboss core services
all versions
redhat
enterprise linux
6.0, 7.0, 8.0
netapp
clustered data ontap
all versions
netapp
clustered data ontap antivirus connector
all versions
netapp
ontap select deploy administration utility
all versions
oracle
zfs storage appliance kit
8.8

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