CVE-2021-28235 Etcd-io Improper Authentication vulnerability
Remote attackers can escalate privileges in etcd via the debug function, requiring administrators to upgrade to a patched version.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-28235?
CVE-2021-28235 is a critical vulnerability in n/a, published on 4 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.
Weakness: CWE-287
Which versions are affected by CVE-2021-28235?
3 open source packages ship an affected version, including go.etcd.io/etcd/v3 and etcd. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
go.etcd.io/etcd/v3 Go | All versions | None |
go.etcd.io/etcd/v3 Go | All versions | None |
etcd Bitnami | From 3.4.10 | 3.4.11 |
Linux distribution packages (4)
etcd openSUSE:Tumbleweed | All versions | 3.5.8-1.1 |
etcd-for-k8s1.25 openSUSE:Tumbleweed | All versions | 3.5.9-1.1 |
etcd-for-k8s1.26 openSUSE:Tumbleweed | All versions | 3.5.9-1.1 |
etcd-for-k8s1.27 openSUSE:Tumbleweed | All versions | 3.5.9-1.1 |
Products include Etcd Etcd.
How do I fix CVE-2021-28235?
Upgrade to a fixed version.
Is CVE-2021-28235 being exploited?
There is no known exploitation of CVE-2021-28235 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in n/a
- CVE-2026-33413 etcd: Authorization bypasses in multiple APIs
- CVE-2022-34038 Denial of service in n/a
- CVE-2018-16886 go.etcd.io/etcd Authentication Bypass
- CVE-2026-59818 etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation
- CVE-2020-15106 Improper Input Validation in etcd
Sources
Also known as AZL-26139, BIT-etcd-2021-28235, DEBIAN-CVE-2021-28235, GHSA-gmph-wf7j-9gcm, UBUNTU-CVE-2021-28235, USN-6189-1 and 4 more.