SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityAnalyzed

CVE-2023-41991

Apple Multiple Products Improper Certificate Validation Vulnerability

KEVMEDIUM 5.5EPSS 4.55%

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
4.55% probability · 91th percentile
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

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.