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HIGH severity

Denial of service in HashiCorp ConsulGHSA-496g-fr33-whrf

HIGHFix: hashicorp/consul#9024

GHSA-496g-fr33-whrf is a high-severity (CVSS 7.5) vulnerability in github.com/hashicorp/consul. A fix is available for github.com/hashicorp/consul — see the affected versions and patch details below.

Also known asBIT-consul-2020-25201CVE-2020-25201GO-2024-2501
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs86th percentile — riskier than 86% of all scored CVEsHighest risk
1.04%1.73%2.42%3.11%1.5%2.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐹github.com/hashicorp/consul🐹github.com/hashicorp/consul

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

HashiCorp Consul Enterprise versions 1.7.0 up to 1.7.8 and 1.8.0 up to 1.8.4 includes a namespace replication bug which can be triggered to cause denial of service via infinite Raft writes. Fixed in 1.7.9 and 1.8.5.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/hashicorp/consul≥ 1.7.0&&< 1.7.91.7.9go get github.com/hashicorp/consul@v1.7.9
🐹Gogithub.com/hashicorp/consul≥ 1.8.0&&< 1.8.51.8.5go get github.com/hashicorp/consul@v1.8.5

Affected Products

1 product · 1 configurations
Application
consulhashicorp
≥ 1.7.0 && ≤ 1.8.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/hashicorp/consul, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/hashicorp/consul to 1.7.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-496g-fr33-whrf is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

HashiCorp Consul Enterprise versions 1.7.0 up to 1.7.8 and 1.8.0 up to 1.8.4 includes a namespace replication bug which can be triggered to cause denial of service via infinite Raft writes. Fixed in 1.7.9 and 1.8.5.
O3 Security · Impact-Aware SCA

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Denial of service in HashiCorp Consul (High 7.5)