CVE-2020-36402

Name: CVE-2020-36402
Creator: NVD / NIST
Published: 2021-07-01T03:15:07.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.96%

Last modified Jun 17, 2026

CVE-2020-36402 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Solidity 0.7.5 has a stack-use-after-return issue in smtutil::CHCSmtLib2Interface::querySolver. NOTE: c39a5e2b7a3fabbf687f53a2823fc087be6c1a7e is cited in the OSV "fixed" field but does not have a code change.. EPSS estimates a 0.96% chance of exploitation in the next 30 days.

Description

Solidity 0.7.5 has a stack-use-after-return issue in smtutil::CHCSmtLib2Interface::querySolver. NOTE: c39a5e2b7a3fabbf687f53a2823fc087be6c1a7e is cited in the OSV "fixed" field but does not have a code change.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.96%

57.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Soliditylang	Solidity	0.7.5

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26997Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/ethereum/solidity/commit/c39a5e2b7a3fabbf687f53a2823fc087be6c1a7ePatch, Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/solidity/OSV-2020-2131.yamlThird Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26997Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/ethereum/solidity/commit/c39a5e2b7a3fabbf687f53a2823fc087be6c1a7ePatch, Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/solidity/OSV-2020-2131.yamlThird Party Advisory

Timeline

Published: Jul 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-36402?

How severe is CVE-2020-36402?

CVE-2020-36402 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.96% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36402?

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-2020-36402?

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

Scan your code now

Source: NVD / NIST