Vulnerability · Published Aug 27, 2021 · Assigned by XEN
CVE-2021-28700
Medium 4.9
In plain English
A medium-severity security flaw in xen from Xen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)4.9Medium
Exploit odds (30 days)1.9%top 20.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
xen/arm: No memory limit for dom0less domUs The dom0less feature allows an administrator to create multiple unprivileged domains directly from Xen. Unfortunately, the memory limit from them is not set. This allow a domain to allocate memory beyond what an administrator originally configured.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.15.0-r2 | ALPINE-CVE-2021-28700 |
| Alpine:v3.21 | xen | 4.15.0-r2 | ALPINE-CVE-2021-28700 |
| Alpine:v3.22 | xen | 4.15.0-r2 | ALPINE-CVE-2021-28700 |
| Alpine:v3.23 | xen | 4.15.0-r2 | ALPINE-CVE-2021-28700 |
| Alpine:v3.24 | xen | 4.15.0-r2 | ALPINE-CVE-2021-28700 |
| Debian:12 | xen | 4.14.3-1 | DEBIAN-CVE-2021-28700 |
| Debian:13 | xen | 4.14.3-1 | DEBIAN-CVE-2021-28700 |
| Debian:14 | xen | 4.14.3-1 | DEBIAN-CVE-2021-28700 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-28700 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-28700 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2021-28700 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-28700 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2021-28700 |
Affected products (as reported)
References
- https://xenbits.xenproject.org/xsa/advisory-383.txt x_refsource_MISC
- FEDORA-2021-4f129cc0c1 vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-d68ed12e46 vendor-advisory, x_refsource_FEDORA
- DSA-4977 vendor-advisory, x_refsource_DEBIAN
- FEDORA-2021-081f9bf5d2 vendor-advisory, x_refsource_FEDORA
- GLSA-202208-23 vendor-advisory, x_refsource_GENTOO