CVE-2021-39162

moderate-risk
Published 2021-09-09

Pomerium is an open source identity-aware access proxy. Envoy, which Pomerium is based on, can abnormally terminate if an H/2 GOAWAY and SETTINGS frame are received in the same IO event. This can lead to a DoS in the presence of untrusted *upstream* servers. 0.15.1 contains an upgraded envoy binary with this vulnerability patched. If only trusted upstreams are configured, there is not substantial risk of this condition being triggered.

Do I need to act?

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0.67% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.6/10 High
NETWORK / LOW complexity

Affected Products (3)

Pomerium

Affected Vendors

Envoyproxy Pomerium

References (6)

Third Party Advisory https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8
Third Party Advisory https://github.com/pomerium/pomerium/security/advisories/GHSA-gjcg-vrxg-xmgv
Not Applicable https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ
Third Party Advisory https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8
Third Party Advisory https://github.com/pomerium/pomerium/security/advisories/GHSA-gjcg-vrxg-xmgv
Not Applicable https://groups.google.com/g/envoy-announce/c/5xBpsEZZDfE/m/wD05NZBbAgAJ
40
/ 100
moderate-risk
Severity 29/34 · Critical
Exploitability 2/34 · Minimal
Exposure 9/34 · Low