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HIGH severity

Denial of Service (DoS) in HashiCorp ConsulGHSA-23jv-v6qj-3fhh

HIGH

GHSA-23jv-v6qj-3fhh is a high-severity (CVSS 7.5) CWE-770 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-2020-7219CVE-2020-7219GO-2022-0776
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.0%probability of exploitation in next 30 days
Lower Risk+0.03%
Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk
0.64%1.27%1.90%2.54%1.1%2.0%2.0%May 26Oct 26Oct 26

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

How urgent is this, really

GHSA-23jv-v6qj-3fhh by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹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 and Consul Enterprise up to 1.6.2 HTTP/RPC services allowed unbounded resource usage, and were susceptible to unauthenticated denial of service. Fixed in 1.6.3.

Specific Go Packages Affected

github.com/hashicorp/consul/agent/consul

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/hashicorp/consulall versions1.6.3go get github.com/hashicorp/consul@v1.6.3

Affected Products

1 product · 2 configurations
Application
consulhashicorp
< 1.6.2
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 1.6.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-23jv-v6qj-3fhh 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.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate
Workaround published by Red Hat
Enforce network connection limits on Consul server agents by using the following iptables rule: iptables -A INPUT -p tcp --syn --dport 8300 -m connlimit --connlimit-above 100 -j REJECT --reject-with tcp-reset.
Source: Red Hat security advisory for GHSA-23jv-v6qj-3fhh (CC BY 4.0)

Frequently Asked Questions

HashiCorp Consul and Consul Enterprise up to 1.6.2 HTTP/RPC services allowed unbounded resource usage, and were susceptible to unauthenticated denial of service. Fixed in 1.6.3. ### Specific Go Packages Affected github.com/hashicorp/consul/agent/consul
O3 Security · Impact-Aware SCA

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Denial of Service (DoS) in HashiCorp Consul (High 7.5)