Vulnerability in Envoyproxy Envoy
CVE-2021-39204
Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, incorrectly handles resetting of HTTP/2 streams with excessive complexity. This can lead to high CPU utilization when a large number of streams are reset. This can result in a DoS condition. Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.017 (75.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Envoyproxy Envoy — versions 1.19.0
- Pomerium — versions 0.15.0, >= 0.15.0, < 0.15.1, < 0.14.8
Weakness classification (CWE)
Public proof-of-concept exploits
References
- groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ (Not Applicable)
- github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc (Third Party Advisory)
- github.com/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39204?
- CVE-2021-39204 is a high-severity vulnerability in Envoyproxy Envoy, classified under Excessive Iteration. CVSS score: 7.5/10. Published 2021-09-09.
- How severe is CVE-2021-39204?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-39204 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.