CVE-2021-36976: apple ipados Use After Free
CVSS: 6.5v3.1MediumModified
AliasesALPINE-CVE-2021-36976RHBA-2022:3897UBUNTU-CVE-2021-36976DEBIAN-CVE-2021-36976
Published 20-07-2021Last modified 03-11-2025
Vulnerability summary
CVE-2021-36976 is a medium (CVSS 6.5) Use After Free vulnerability in apple ipados. EPSS estimates a 2.84% chance of exploitation in the next 30 days, higher than 86.4% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
2.84%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 8 · Related 6Timeline
- 20-07-2021PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).
CVSS metrics
6 scores · 5 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HSourcesAll 5 agree
- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · Red hatEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.84%
Chance of exploitation in the next 30 days
Percentile
86%
Versus all other CVEs
30-day change
0.00 pp
From 2.84% on 19-09-2026
19-09-202619-10-2026
EPSS score2.84%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat8 products
- bsdcat-debuginfo< 0:3.5.3-1.el9
- bsdcpio-debuginfo< 0:3.5.3-1.el9
- bsdtar< 0:3.5.3-1.el9
- bsdtar-debuginfo< 0:3.5.3-1.el9
- libarchive< 0:3.5.3-1.el9
Alpine1 product
- libarchive≥ 3.4.1, < 3.5.3-r0 | ≥ 3.4.1, < 3.6.0-r0
Debian1 product
- libarchive< 3.6.0-1
Fedoraproject1 product
- fedoraEOL35
Libarchive1 product
- libarchive≥ 3.4.1, ≤ 3.5.2
Splunk1 product
- universal_forwarder≥ 8.2.0, < 8.2.12 | ≥ 9.0.0, < 9.0.6 | 9.1.0
Ubuntu1 product
- libarchive< 3.4.0-2ubuntu1.1 | < 3.5.2-1ubuntu1
8 vendors · 18 products
References
23 links- github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yamlX Refsource MISCREPORTThird Party Advisory
- bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375X Refsource MISCIssue TrackingThird Party Advisory
