GHSA-wj6x-hcc2-f32j BIT-consul-2023-0845 CVE-2023-0845 GO-2023-1639

Consul Server Panic when Ingress and API Gateways Configured with Peering Connections

Medium Go

Severity: 6.5 / 10; Medium · CVSS 3.1
Exploit chance (EPSS): 1.00%; Chance of exploitation in the next 30 days. Higher than 62.98% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: CWE-476 NULL Pointer Dereference
Fix: 1.14.5; Upgrade github.com/hashicorp/consul to this version or later

Description

A vulnerability was identified in Consul and Consul Enterprise (“Consul”) an authenticated user with service:write permissions could trigger a workflow that causes Consul server and client agents to crash under certain circumstances. To exploit this vulnerability, an attacker requires access to an ACL token with service:write permissions, and there needs to be at least one running ingress or API gateway that is configured to route traffic to an upstream service.

Affected versions

Go

Package	Vulnerable	Fixed in
github.com/hashicorp/consul	`>= 1.14.0, < 1.14.5`	`1.14.5`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

github.com/hashicorp/consul Go → `1.14.5`

go

go get github.com/hashicorp/consul@v1.14.5 && go mod tidy

Severity breakdown

CVSS 3.1 6.5

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

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Weakness

CWE-476: NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

How to prevent it

Implementation: For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Requirements: Select a programming language that is not susceptible to these issues.
Implementation: Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Architecture and Design: Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
Implementation: Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.

References

Advisories

Packages

github.com/hashicorp/consul

Timeline

Mar 9, 2023 Published
Aug 7, 2026 Last updated by the source
Nov 1, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-cpfq-66p2-336j Consul is vulnerable to arbitrary file read when configured with Kubernetes authentication	Medium	Also affects github.com/hashicorp/consul
GHSA-qh7p-pfq3-677h Consul event endpoint is vulnerable to denial of service	Medium	Also affects github.com/hashicorp/consul
GHSA-7g3r-8c6v-hfmr Consul key/value endpoint is vulnerable to denial of service	Medium	Also affects github.com/hashicorp/consul
GHSA-99wr-c2px-grmh Hashicorp Consul Cross-site Scripting vulnerability	Medium	Also affects github.com/hashicorp/consul
GHSA-5c4w-8hhh-3c3h Hashicorp Consul Improper Neutralization of HTTP Headers for Scripting Syntax vulnerability	Medium	Also affects github.com/hashicorp/consul
GHSA-chgm-7r52-whjj Hashicorp Consul Path Traversal vulnerability	Medium	Also affects github.com/hashicorp/consul
GHSA-6m72-467w-94rh Privilege Escalation in HashiCorp Consul	Medium	Also affects github.com/hashicorp/consul
GHSA-496g-fr33-whrf Denial of service in HashiCorp Consul	High	Also affects github.com/hashicorp/consul

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