CVE-2021-31920 Security feature bypass in n/a
Attackers can bypass path-based authorization policies in Istio by using multiple slashes or escaped characters in HTTP requests.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-31920?
CVE-2021-31920 is a medium-severity vulnerability in n/a, published on 27 May 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.
Weakness: CWE-706
Which versions are affected by CVE-2021-31920?
It affects 1 product.
Products include Istio Istio.
How do I fix CVE-2021-31920?
Upgrade to a fixed version.
Is CVE-2021-31920 being exploited?
There is no known exploitation of CVE-2021-31920 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2021-31921 Missing authorization in n/a
- CVE-2021-34824 Information disclosure in n/a
- CVE-2026-31837 Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.
- CVE-2021-39155 Authorization Policy Bypass Due to Case Insensitive Host Comparison
- CVE-2021-39156 Fragments in Path May Lead to Authorization Policy Bypass