CVE-2021-36976

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.84% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 85.4% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-07-20 06:49Z5 YR AGO

Last updated

2025-11-03 21:45Z10 MO AGO

Reserved

2021-07-20

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

8f1c00590467fadddc8f8dd8c8e91b67ed98e05fb4f5c334470ffac73c32b607

• github.comhttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yamlx_refsource_MISC
• bugs.chromium.orghttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2022-9bb794c5f5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/vendor-advisoryx_refsource_FEDORA
• support.apple.comhttps://support.apple.com/kb/HT213183x_refsource_CONFIRM
• support.apple.comhttps://support.apple.com/kb/HT213182x_refsource_CONFIRM
• support.apple.comhttps://support.apple.com/kb/HT213193x_refsource_CONFIRM
• seclists.org20220314 APPLE-SA-2022-03-14-2 watchOS 8.5http://seclists.org/fulldisclosure/2022/Mar/28mailing-listx_refsource_FULLDISC
• seclists.org20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3http://seclists.org/fulldisclosure/2022/Mar/29mailing-listx_refsource_FULLDISC
• seclists.org20220314 APPLE-SA-2022-03-14-1 iOS 15.4 and iPadOS 15.4http://seclists.org/fulldisclosure/2022/Mar/27mailing-listx_refsource_FULLDISC
• security.gentoo.orgGLSA-202208-26https://security.gentoo.org/glsa/202208-26vendor-advisoryx_refsource_GENTOO
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/11/msg00007.html