CVE-2021-30851: apple ios and ipados Out-of-bounds Write
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-30851DEBIAN-CVE-2021-30851
Published 24-08-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-30851 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in apple ios and ipados. EPSS estimates a 2.39% chance of exploitation in the next 30 days, higher than 83.7% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
2.39%
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 16 · Related 11Timeline
- 24-08-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A memory corruption vulnerability was addressed with improved locking. This issue is fixed in Safari 15, tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing maliciously crafted web content may lead to code execution.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.39%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
0.00 pp
From 2.39% on 19-09-2026
19-09-202619-10-2026
EPSS score2.39%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Apple7 products
- ios and ipados≥ unspecified, < 15
- ipados< 15.0
- iphone_os< 15.0
- macosEOL< 12.0.1 | 12.0.1
- safari≥ unspecified, < 15 | < 15.0
Ubuntu5 products
- qtwebkit-opensource-srcAll versions (No fix recorded)
- qtwebkit-sourceAll versions (No fix recorded)
- webkit2gtkAll versions (No fix recorded) | < 2.34.1-0ubuntu0.20.04.1 | < 2.34.0-1ubuntu1
- webkitgtkAll versions (No fix recorded)
- wpewebkitAll versions (No fix recorded)
Debian3 products
- webkit2gtk< 2.34.0-1
- wpewebkit< 2.34.1-1
- debian_linuxEOL10.0 | 11.0
Fedoraproject1 product
- fedoraEOL33 | 34
4 vendors · 16 products
References
15 links- support.apple.com/en-us/HT212814X Refsource MISC
- support.apple.com/en-us/HT212819X Refsource MISC
- support.apple.com/en-us/HT212815X Refsource MISC
- support.apple.com/en-us/HT212816X Refsource MISC
- support.apple.com/kb/HT212869X Refsource CONFIRM
