CVE-2023-41991
Apple Multiple Products Improper Certificate Validation Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 16 October 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- EPSS
- 13.38% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 25 September 2023 · due 16 October 2023
- Weakness
- CWE-295
- Affected
- apple/ipados · apple/iphone os · apple/macos
- Source
- product-security@apple.com
EPSS moved from 14.5% on 22 September 2026 to 13.4% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://support.apple.com/en-us/HT213926, https://support.apple.com/en-us/HT213927, https://support.apple.com/en-us/HT213928, https://support.apple.com/en-us/HT213929, https://support.apple.com/en-us/HT213931 ; https://nvd.nist.gov/vuln/detail/CVE-2023-41991
References
- https://support.apple.com/en-us/HT213927Vendor Advisory
- https://support.apple.com/en-us/HT213931Vendor Advisory
- https://support.apple.com/en-us/HT213927Vendor Advisory
- https://support.apple.com/en-us/HT213931Vendor Advisory
- https://support.apple.com/kb/HT213927Vendor Advisory
- https://support.apple.com/kb/HT213931Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-41991US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.