Is CVE-2021-39204 in the CISA KEV catalog?

No. CVE-2021-39204 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39204?

CVE-2021-39204 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-39204?

CVE-2021-39204 has an EPSS score of 1.61% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39204?

Upgrade envoy to 1.18.4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-39204

HIGHEPSS 73th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-834

How to fix

Remediation Available

envoyNVD

Affected:>= 1.18.0, < 1.18.4Fixed in:1.18.4CVE-2021-39204derived from NVD

pomeriumNVD

Affected:< 0.14.8Fixed in:0.14.8CVE-2021-39204derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.61%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Third-Party Advisory2

Other references1

groups.google.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.