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High, CVSS 7.5

Excessive CPU usage

CVE-2021-39204GHSA-5wjf-62hw-q78r

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/pomerium/pomerium 0.15.1, 0.14.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2021-39204: 1.66% estimated exploitation activity in the next 30 days; percentile 76.72 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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. Impact This can result in a DoS condition. Patches Pomerium versions 0.14.8 and 0.15.1 contain an upgraded envoy binary with this vulnerability patched. Workarounds N/A References envoy GSA envoy CVE envoy announcement For more information If you have any questions or comments about this advisory: Open an issue in pomerium/pomerium Email us at security@pomerium.com

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-5wjf-62hw-q78r

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-39204

Advisory: Excessive CPU usage
IDs: CVE-2021-39204, GHSA-5wjf-62hw-q78r
Record: https://patchnext.com/advisories/cve-2021-39204 (revision 1, source checked 26 Oct 2026, 14:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/pomerium/pomerium 0.15.1, 0.14.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/pomerium/pomerium: affected < 0.14.8; >= 0.15.0, <= 0.15.0; fixed in 0.15.1, 0.14.8

## Suggested inspection (read-only)
- Go github.com/pomerium/pomerium: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/pomerium/pomerium.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5wjf-62hw-q78r (GitHub-reviewed advisory GHSA-5wjf-62hw-q78r lists affected ranges: Go github.com/pomerium/pomerium >=0 =0.15.0 <=0.15.0)

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