CVE-2021-39204 json
Excessive CPU usage in Pomerium
published 2021-09-09 5 y ago modified 2026-09-08 2 mo ago also BIT-envoy-2021-39204 , EUVD-2021-1989 , GHSA-5wjf-62hw-q78r
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 76%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/pomerium/pomerium 0.14.8, 0.15.1
- bitnami envoy 1.16.5, 1.17.4, 1.18.4, 1.19.1
- envoyproxy envoy 1.17.4, 1.18.4
- pomerium pomerium 0.14.8
Exploit prediction
1.66% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/pomerium/pomerium | <0.14.8 >=0.15.0, <0.15.1 |
0.14.8 0.15.1 |
| bitnami | envoy | <1.16.5 >=1.17.0, <1.17.4 >=1.18.0, <1.18.4 >=1.19.0, <1.19.1 |
1.16.5 1.17.4 1.18.4 1.19.1 |
Affected products
- pomerium pomerium
Classification
- Weakness
-
- CWE-834 Excessive Iteration
References
-
groups.google.com
/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ
web, not-applicable
-
github.com
/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc
web, third-party-advisory, advisory
-
github.com
/pomerium/pomerium/security/advisories/GHSA-5wjf-62hw-q78r
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-39204
advisory, web
-
github.com
/pomerium/pomerium
package
Sources
- CVE List CVE-2021-39204
- GitHub Advisory GHSA-5wjf-62hw-q78r
- NVD CVE-2021-39204
- OSV BIT-envoy-2021-39204
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