CVE-2024-21643 is a critical vulnerability in Microsoft IdentityModel Extensions for .NET, specifically affecting implementations of the SignedHttpRequest protocol or SignedHttpRequestValidator. It arises from the default trust in the 'jku' claim, allowing for arbitrary remote or local HTTP GET requests. With a CVSS score of 8.8 (High), this vulnerability presents a low-complexity attack vector that can lead to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog. Users are advised to update Microsoft.IdentityModel versions to 7.1.2 (or higher) or 6.34.0 (or higher) to mitigate this risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 6.34.0CPE matchmatch criteria | cpe:2.3:a:microsoft:identitymodel_extensions:*:*:*:*:*:.net:*:* | ||
>= 7.0.0, < 7.1.2CPE matchmatch criteria | cpe:2.3:a:microsoft:identitymodel_extensions:*:*:*:*:*:.net:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.