CVE-2021-41135

Name: CVE-2021-41135
Creator: NVD / NIST
Published: 2021-10-20T18:15:07.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.66%

Last modified Jun 17, 2026

CVE-2021-41135 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Cosmos-SDK is a framework for building blockchain applications in Golang. Affected versions of the SDK were vulnerable to a consensus halt due to non-deterministic behaviour in a ValidateBasic method in the x/authz module. EPSS estimates a 1.66% chance of exploitation in the next 30 days.

Description

The Cosmos-SDK is a framework for building blockchain applications in Golang. Affected versions of the SDK were vulnerable to a consensus halt due to non-deterministic behaviour in a ValidateBasic method in the x/authz module. The MsgGrant of the x/authz module contains a Grant field which includes a user-defined expiration time for when the authorization grant expires. In Grant.ValidateBasic(), that time is compared to the node’s local clock time. Any chain running an affected version of the SDK with the authz module enabled could be halted by anyone with the ability to send transactions on that chain. Recovery would require applying the patch and rolling back the latest block. Users are advised to update to version 0.44.2.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.66%

73.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-754

Affected Software

Vendor	Product	Versions
Interchain	Cosmos Sdk	>= 0.43.0, < 0.44.2

References

https://forum.cosmos.network/t/cosmos-sdk-vulnerability-retrospective-security-advisory-jackfruit-october-12-2021/5349Exploit, Vendor Advisory
https://github.com/cosmos/cosmos-sdk/commit/68ab790a761e80d3674f821794cf18ccbfed45eePatch, Third Party Advisory
https://github.com/cosmos/cosmos-sdk/security/advisories/GHSA-2p6r-37p9-89p2Third Party Advisory
https://forum.cosmos.network/t/cosmos-sdk-vulnerability-retrospective-security-advisory-jackfruit-october-12-2021/5349Exploit, Vendor Advisory
https://github.com/cosmos/cosmos-sdk/commit/68ab790a761e80d3674f821794cf18ccbfed45eePatch, Third Party Advisory
https://github.com/cosmos/cosmos-sdk/security/advisories/GHSA-2p6r-37p9-89p2Third Party Advisory

Timeline

Published: Oct 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41135?

How severe is CVE-2021-41135?

CVE-2021-41135 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41135?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41135?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST