CVE-2021-1817: apple ios and ipados Out-of-bounds Write
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-1817DEBIAN-CVE-2021-1817
Published 08-09-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-1817 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in apple ios and ipados. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 79.7% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.94%
0%100%
Low · +0.07 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 9 · Related 6Timeline
- 08-09-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may lead to arbitrary 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
1.94%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
+0.07 pp
From 1.87% on 18-09-2026
18-09-202618-10-2026
EPSS score1.94%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Apple6 products
- ios and ipados≥ unspecified, < 14.5
- ipados< 14.5
- iphone_os< 14.5
- macos≥ unspecified, < 11.3 | ≥ 11.0, < 11.3
- tvos≥ unspecified, < 14.5 | < 14.5
Ubuntu5 products
- qtwebkit-opensource-srcAll versions (No fix recorded)
- qtwebkit-sourceAll versions (No fix recorded)
- webkit2gtkAll versions (No fix recorded) | < 2.30.3-0ubuntu0.18.04.1 | < 2.30.3-0ubuntu0.20.04.1
- webkitgtkAll versions (No fix recorded)
- wpewebkitAll versions (No fix recorded)
Debian2 products
- webkit2gtk< 2.30.1-1
- wpewebkit< 2.30.0-1
3 vendors · 13 products
