CVE-2021-28697 is a high-severity vulnerability in Xen hypervisor, affecting various Debian and Fedora distributions. It allows a guest virtual machine to retain access to de-allocated grant table v2 status pages, potentially leading to information disclosure or privilege escalation. With a CVSS score of 7.8, this local attack requires low privileges and has a high impact on confidentiality, integrity, and availability. While no public exploit code or active exploitation has been reported, there is some community discussion and media coverage, indicating awareness of the vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.0.0, <= 4.15.0CPE matchmatch criteria | cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | ||
34CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | ||
35CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | ||
11.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.