What is CVE-2021-29492?

CVE-2021-29492 is a high-severity vulnerability in Envoyproxy Envoy, classified under Path Traversal. CVSS score: 8.1/10. Published 2021-05-28.

How severe is CVE-2021-29492?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2021-29492 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Envoyproxy Envoy

CVE-2021-29492

Envoy is a cloud-native edge/middle/service proxy. Envoy does not decode escaped slash sequences `%2F` and `%5C` in HTTP URL paths in versions 1.18.2 and before. A remote attacker may craft a path with escaped slashes, e.g. `/something%2F…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.105 (93.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Envoyproxy Envoy — versions <= 1.18.2

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

datawire/ambassador-docs

References

github.com/envoyproxy/envoy/security/advisories/GHSA-4987-27fx-x6cf (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2021-29492?: CVE-2021-29492 is a high-severity vulnerability in Envoyproxy Envoy, classified under Path Traversal. CVSS score: 8.1/10. Published 2021-05-28.
How severe is CVE-2021-29492?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2021-29492 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.