HashiCorp Consul

Consul DoS via KV Endpoint CVE202511374 (Fixed in v1.22.0)
CVE-2025-11374 6.5 - Medium - October 28, 2025

Consul and Consul Enterprises (Consul) key/value endpoint is vulnerable to denial of service (DoS) due to incorrect Content Length header validation. This vulnerability, CVE-2025-11374, is fixed in Consul Community Edition 1.22.0 and Consul Enterprise 1.22.0, 1.21.6, 1.20.8 and 1.18.12.

Allocation of Resources Without Limits or Throttling

Consul DoS via Unbounded Content-Length; V1.22.0+ Fixes
CVE-2025-11375 6.5 - Medium - October 28, 2025

Consul and Consul Enterprises (Consul) event endpoint is vulnerable to denial of service (DoS) due to lack of maximum value on the Content Length header. This vulnerability, CVE-2025-11375, is fixed in Consul Community Edition 1.22.0 and Consul Enterprise 1.22.0, 1.21.6, 1.20.8 and 1.18.12.

Allocation of Resources Without Limits or Throttling

Consul L7 Intent Path Bypass HTTP Path Rules
CVE-2024-10005 5.8 - Medium - October 30, 2024

A vulnerability was identified in Consul and Consul Enterprise (Consul) such that using URL paths in L7 traffic intentions could bypass HTTP request path-based access rules.

Directory traversal

Consul L7 Intentions Header Bypass
CVE-2024-10006 5.8 - Medium - October 30, 2024

A vulnerability was identified in Consul and Consul Enterprise (Consul) such that using Headers in L7 traffic intentions could bypass HTTP header based access rules.

Output Sanitization

Consul XSS via Missing Content-Type Header
CVE-2024-10086 6.1 - Medium - October 30, 2024

A vulnerability was identified in Consul and Consul Enterprise such that the server response did not explicitly set a Content-Type HTTP header, allowing user-provided inputs to be misinterpreted and lead to reflected XSS.

XSS

GitLab EE Consul enable-script-checks Bypass
CVE-2023-5332 8.1 - High - December 04, 2023

Patch in third party library Consul requires 'enable-script-checks' to be set to False. This was required to enable a patch by the vendor. Without this setting the patch could be bypassed. This only affects GitLab-EE.

HashiCorp Consul 1.16.0 | JWT Auth mesh ID bypass, fixed 1.16.1
CVE-2023-3518 7.3 - High - August 09, 2023

HashiCorp Consul and Consul Enterprise 1.16.0 when using JWT Auth for service mesh incorrectly allows/denies access regardless of service identities. Fixed in 1.16.1.

Consul DDoS via peer cluster state corruption, fixed in 1.14.5/1.15.3
CVE-2023-1297 7.5 - High - June 02, 2023

Consul and Consul Enterprise's cluster peering implementation contained a flaw whereby a peer cluster with service of the same name as a local service could corrupt Consul state, resulting in denial of service. This vulnerability was resolved in Consul 1.14.5, and 1.15.3

Consul: Remote Proxy Modification via Envoy Extensions (CVE-2023-2816)
CVE-2023-2816 6.5 - Medium - June 02, 2023

Consul and Consul Enterprise allowed any user with service:write permissions to use Envoy extensions configured via service-defaults to patch remote proxy instances that target the configured service, regardless of whether the user has permission to modify the service(s) corresponding to those modified proxies.

Consul Authenticated Workflow Crash via service:write (before 1.14.5)
CVE-2023-0845 6.5 - Medium - March 09, 2023

Consul and Consul Enterprise allowed an authenticated user with service:write permissions to trigger a workflow that causes Consul server and client agents to crash under certain circumstances. This vulnerability was fixed in Consul 1.14.5.

NULL Pointer Dereference

Consul 1.13.*: Unfiltered cluster nodes/services via HTTP/RPC UI endpoints
CVE-2022-3920 7.5 - High - November 16, 2022

HashiCorp Consul and Consul Enterprise 1.13.0 up to 1.13.3 do not filter cluster filtering's imported nodes and services for HTTP or RPC endpoints used by the UI. Fixed in 1.14.0.

AuthZ

HashiCorp Consul: Bypass Intentions via Multi-SAN URI (CVE-2022-40716)
CVE-2022-40716 6.5 - Medium - September 23, 2022

HashiCorp Consul and Consul Enterprise up to 1.11.8, 1.12.4, and 1.13.1 do not check for multiple SAN URI values in a CSR on the internal RPC endpoint, enabling leverage of privileged access to bypass service mesh intentions. Fixed in 1.11.9, 1.12.5, and 1.13.2."

Unchecked Return Value

Consul Improper Node/Segment Validation in JWT Claims 1.8.1-1.11.8, 1.12-1.13.1
CVE-2021-41803 7.1 - High - September 23, 2022

HashiCorp Consul 1.8.1 up to 1.11.8, 1.12.4, and 1.13.1 do not properly validate the node or segment names prior to interpolation and usage in JWT claim assertions with the auto config RPC. Fixed in 1.11.9, 1.12.5, and 1.13.2."

AuthZ

HashiCorp Consul and Consul Enterprise up to 1.9.16, 1.10.9, and 1.11.4 may
CVE-2022-29153 7.5 - High - April 19, 2022

HashiCorp Consul and Consul Enterprise up to 1.9.16, 1.10.9, and 1.11.4 may allow server side request forgery when the Consul client agent follows redirects returned by HTTP health check endpoints. Fixed in 1.9.17, 1.10.10, and 1.11.5.

SSRF

HashiCorp Consul and Consul Enterprise 1.9.0 through 1.9.14, 1.10.7, and 1.11.2 clusters with at least one Ingress Gateway allow a user with service:write to register a specifically-defined service
CVE-2022-24687 6.5 - Medium - February 24, 2022

HashiCorp Consul and Consul Enterprise 1.9.0 through 1.9.14, 1.10.7, and 1.11.2 clusters with at least one Ingress Gateway allow a user with service:write to register a specifically-defined service that can cause Consul servers to panic. Fixed in 1.9.15, 1.10.8, and 1.11.3.

HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4 has Incorrect Access Control
CVE-2021-41805 8.8 - High - December 12, 2021

HashiCorp Consul Enterprise before 1.8.17, 1.9.x before 1.9.11, and 1.10.x before 1.10.4 has Incorrect Access Control. An ACL token (with the default operator:write permissions) in one namespace can be used for unintended privilege escalation in a different namespace.

AuthZ

HashiCorp Consul and Consul Enterprise 1.10.1 Raft RPC layer
CVE-2021-37219 8.8 - High - September 07, 2021

HashiCorp Consul and Consul Enterprise 1.10.1 Raft RPC layer allows non-server agents with a valid certificate signed by the same CA to access server-only functionality, enabling privilege escalation. Fixed in 1.8.15, 1.9.9 and 1.10.2.

Improper Certificate Validation

HashiCorp Consul and Consul Enterprise 1.10.1 Txn.Apply endpoint
CVE-2021-38698 6.5 - Medium - September 07, 2021

HashiCorp Consul and Consul Enterprise 1.10.1 Txn.Apply endpoint allowed services to register proxies for other services, enabling access to service traffic. Fixed in 1.8.15, 1.9.9 and 1.10.2.

AuthZ

HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open
CVE-2021-36213 7.5 - High - July 17, 2021

HashiCorp Consul and Consul Enterprise 1.9.0 through 1.10.0 default deny policy with a single L7 application-aware intention deny action cancels out, causing the intention to incorrectly fail open, allowing L4 traffic. Fixed in 1.9.8 and 1.10.1.

HashiCorp Consul and Consul Enterprise 1.3.0 through 1.10.0 Envoy proxy TLS configuration does not validate destination service identity in the encoded subject alternative name
CVE-2021-32574 7.5 - High - July 17, 2021

HashiCorp Consul and Consul Enterprise 1.3.0 through 1.10.0 Envoy proxy TLS configuration does not validate destination service identity in the encoded subject alternative name. Fixed in 1.8.14, 1.9.8, and 1.10.1.

Improper Certificate Validation

HashiCorp Consul and Consul Enterprise up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-site scripting
CVE-2020-25864 6.1 - Medium - April 20, 2021

HashiCorp Consul and Consul Enterprise up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-site scripting. Fixed in 1.9.5, 1.8.10 and 1.7.14.

XSS

HashiCorp Consul Enterprise version 1.8.0 up to 1.9.4 audit log can be bypassed by specifically crafted HTTP events
CVE-2021-28156 7.5 - High - April 20, 2021

HashiCorp Consul Enterprise version 1.8.0 up to 1.9.4 audit log can be bypassed by specifically crafted HTTP events. Fixed in 1.9.5, and 1.8.10.

An issue was discovered in GoGo Protobuf before 1.3.2
CVE-2021-3121 8.6 - High - January 11, 2021

An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the "skippy peanut butter" issue.

out-of-bounds array index

HashiCorp Consul and Consul Enterprise 1.2.0 up to 1.8.5
CVE-2020-28053 6.5 - Medium - November 23, 2020

HashiCorp Consul and Consul Enterprise 1.2.0 up to 1.8.5 allowed operators with operator:read ACL permissions to read the Connect CA private key configuration. Fixed in 1.6.10, 1.7.10, and 1.8.6.

AuthZ

HashiCorp Consul Enterprise version 1.7.0 up to 1.8.4 includes a namespace replication bug which can be triggered to cause denial of service
CVE-2020-25201 7.5 - High - November 04, 2020

HashiCorp Consul Enterprise version 1.7.0 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.

HashiCorp Consul and Consul Enterprise include an HTTP API (introduced in 1.2.0) and DNS (introduced in 1.4.3) caching feature
CVE-2020-13250 7.5 - High - June 11, 2020

HashiCorp Consul and Consul Enterprise include an HTTP API (introduced in 1.2.0) and DNS (introduced in 1.4.3) caching feature that was vulnerable to denial of service. Fixed in 1.6.6 and 1.7.4.

Buffer Overflow

HashiCorp Consul and Consul Enterprise did not appropriately enforce scope for local tokens issued by a primary data center
CVE-2020-13170 7.5 - High - June 11, 2020

HashiCorp Consul and Consul Enterprise did not appropriately enforce scope for local tokens issued by a primary data center, where replication to a secondary data center was not enabled. Introduced in 1.4.0, fixed in 1.6.6 and 1.7.4.

Improper Input Validation

HashiCorp Consul and Consul Enterprise failed to enforce changes to legacy ACL token rules due to non-propagation to secondary data centers
CVE-2020-12797 - June 11, 2020

HashiCorp Consul and Consul Enterprise failed to enforce changes to legacy ACL token rules due to non-propagation to secondary data centers. Introduced in 1.4.0, fixed in 1.6.6 and 1.7.4.

HashiCorp Consul and Consul Enterprise could crash when configured with an abnormally-formed service-router entry
CVE-2020-12758 - June 11, 2020

HashiCorp Consul and Consul Enterprise could crash when configured with an abnormally-formed service-router entry. Introduced in 1.6.0, fixed in 1.6.6 and 1.7.4.

HashiCorp Consul and Consul Enterprise 1.4.1 through 1.6.2 did not uniformly enforce ACLs across all API endpoints
CVE-2020-7955 - January 31, 2020

HashiCorp Consul and Consul Enterprise 1.4.1 through 1.6.2 did not uniformly enforce ACLs across all API endpoints, resulting in potential unintended information disclosure. Fixed in 1.6.3.

HashiCorp Consul and Consul Enterprise up to 1.6.2 HTTP/RPC services
CVE-2020-7219 - January 31, 2020

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.

HashiCorp Consul 1.4.0 through 1.5.0 has Incorrect Access Control
CVE-2019-12291 - June 06, 2019

HashiCorp Consul 1.4.0 through 1.5.0 has Incorrect Access Control. Keys not matching a specific ACL rule used for prefix matching in a policy can be deleted by a token using that policy even with default deny settings configured.

HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication
CVE-2019-9764 - March 26, 2019

HashiCorp Consul 1.4.3 lacks server hostname verification for agent-to-agent TLS communication. In other words, the product behaves as if verify_server_hostname were set to false, even when it is actually set to true. This is fixed in 1.4.4.

HashiCorp Consul (and Consul Enterprise) 1.4.x before 1.4.3
CVE-2019-8336 - March 05, 2019

HashiCorp Consul (and Consul Enterprise) 1.4.x before 1.4.3 allows a client to bypass intended access restrictions and obtain the privileges of one other arbitrary token within secondary datacenters, because a token with literally "<hidden>" as its secret is used in unusual circumstances.

HashiCorp Consul 0.5.1 through 1.4.0 can use cleartext agent-to-agent RPC communication
CVE-2018-19653 5.9 - Medium - December 09, 2018

HashiCorp Consul 0.5.1 through 1.4.0 can use cleartext agent-to-agent RPC communication because the verify_outgoing setting is improperly documented. NOTE: the vendor has provided reconfiguration steps that do not require a software upgrade.

Cryptographic Issues