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ExploitedIn CISA KEVFix available

CVE-2023-41991

Exploitation confirmed. First attested on 2023-09-25 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2023-09-21
  • Fixed in16.7
  • WeaknessCWE-295

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-09-2119:15CVE publishedNVD
  2. 2023-09-25Added to the CISA KEV catalogCISA KEV
  3. 2023-09-25Listed as exploited by GCVEGCVE
  4. 2023-09-25Exploitation first reportedCISA KEV
  5. 2025-02-0415:13SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-41991?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-41991?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apple ipados
BranchAffectedFixed in
16.7< 16.716.7
17.0= 17.0no fix published
Apple iphone os
BranchAffectedFixed in
16.7< 16.716.7
17.0= 17.0no fix published
Apple macos
BranchAffectedFixed in
13.x≥ 13.0, < 13.613.6

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As apple, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apple iOS and iPadOS
    Affected
    • < 16.7fixed in 16.7custom
  • Apple macOS
    Affected
    • < 13.6fixed in 13.6custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-01-10

Fix

  1. Update Apple ipados to 16.7
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2023-10-16

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifieditsgiddd/CVE-2023-41991dmytrozykov/appsignlambertse/CoreTrust-bypass
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-09-25
Patch Due Date
2023-10-16
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Published
2023-09-21
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-fj3m-2r8f-m4x9

Frequently asked questions

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.

Is CVE-2023-41991 actively exploited?

Yes. CVE-2023-41991 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-10-16.

What is the CVSS score for CVE-2023-41991?

CVE-2023-41991 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

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Sources for this record