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CVE-2021-30952

📛 CVE Title

Alpine Linux: CVE-2021-30952: Integer Overflow or Wraparound

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Description

An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

Overview

State
—
Assigner (CNA)
—
CVSS severity
MEDIUM
CVSS score
CVSS 5.0 / 10 5.0 5.0 / 10
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Effective score
5.0 / 10 MEDIUM source: CNA overview
CWE(s)
—
Reserved
—
Published
2021-08-24 00:00 UTC
Last updated
—
Source
https://www.rapid7.com/db/vulnerabilities/alpine-linux-cve-2021-30952/

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name
Apple Multiple Products Integer Overflow or Wraparound Vulnerability
Vendor / project
Apple
Product
Multiple Products
Date added to KEV
2026-03-05
Remediation due
2026-03-26
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware campaign use
Unknown
CISA notes
https://support.apple.com/en-us/HT212975 ; https://support.apple.com/en-us/HT212976 ; https://support.apple.com/en-us/HT212978 ; https://support.apple.com/en-us/HT212980 ; https://support.apple.com/en-us/HT212982 ; https://nvd.nist.gov/vuln/detail/CVE-2021-30952
CISA listing
www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2021-08-24 19:15:21 UTC
NVD last modified
2026-06-17 03:51:12 UTC
NVD CVSS v3.1
CVSS 7.8 / 10 7.8 7.8 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore
1.8 / 10
Impact subscore
5.9 / 10
EPSS score
0.0762 (probability of exploitation in next 30 days)
EPSS percentile
93.80% vs all CVEs — higher = more likely to be exploited, as of 2026-06-30

NVD-assigned CWE(s): CWE-190 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-06-30 21:48 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2021-17869
Assigner
apple
Published
Aug 24, 2021, 6:50:52 PM
Updated
Mar 6, 2026, 5:01:17 AM
EUVD base score (CVSS 3.1)
8.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EUVD-reported EPSS
7.6200
Vendors
Apple
Products
iOS and iPadOS (unspecified <15.2)
macOS (unspecified <15.2)
macOS (unspecified <12.1)
watchOS (unspecified <8.3)

ENISA description: An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

EUVD references (10)

Affected products — CPE 2.3 (12) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
  • cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:webkitgtk:webkitgtk:*:*:*:*:*:*:*:*
  • cpe:2.3:a:wpewebkit:wpe_webkit:*:*:*:*:*:*:*:*

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

MITRE references (10) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (9)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (22)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (2)

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2021-30952.json.

Not stored.