What is CVE-2023-41991?
A certificate validation issue was addressed. This issue is fixed in macOS Ventura 13.6, iOS 16.7 and iPadOS 16.7. A malicious app may be able to bypass signature validation. Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 16.7.
The record classifies CVE-2023-41991 under weakness class CWE-295. Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on integrity. 5 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1137 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 5.5 — MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - EPSS (FIRST)
- 13.3% probability of exploitation in the next 30 days, higher than 96.3% of all scored CVEs
- CISA KEV
- Listed since 2023-09-25, federal remediation deadline 2023-10-16
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2023-09-21, last modified 2025-11-04
Is CVE-2023-41991 being exploited?
CISA added CVE-2023-41991 to the Known Exploited Vulnerabilities catalog on 2023-09-25, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-10-16 under BOD 22-01. Weaponised exploit code for CVE-2023-41991 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 47 in the Threadlinqs vulnerability feed.
- itsgiddd/CVE-2023-41991 (github)
- dmytrozykov/appsign (github)
- trickest/cve (trickest)
Affected products and versions
- Apple: Ipados, Ipados 17.0, Iphone Os, Iphone Os 17.0, Macos
How to fix CVE-2023-41991
The record marks a vendor fix as available for CVE-2023-41991. Patch reference: https://support.apple.com/en-us/HT213926. Vendor advisory: https://support.apple.com/en-us/HT213927. Because CVE-2023-41991 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-10-16. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2023-41991
2 tracked threats in the Threadlinqs corpus reference CVE-2023-41991, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.