Vulnerability · Published Apr 4, 2023 · Assigned by mitre
CVE-2021-28235
Critical 9.8
In plain English
A critical-severity security flaw in the etcd package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.6%top 23.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | etcd | no fix listed | DEBIAN-CVE-2021-28235 |
| Debian:13 | etcd | 3.4.30-1 | DEBIAN-CVE-2021-28235 |
| Debian:14 | etcd | 3.4.30-1 | DEBIAN-CVE-2021-28235 |
| Go | go.etcd.io/etcd/v3 | no fix listed | GHSA-gmph-wf7j-9gcm |
| Ubuntu:25.10 | etcd | no fix listed | UBUNTU-CVE-2021-28235 |
| Ubuntu:26.10 | etcd | no fix listed | UBUNTU-CVE-2021-28235 |
