CVE-2020-36402 json
Solidity 0.7.5 has a stack-use-after-return issue in smtutil::CHCSmtLib2Interface::querySolver.
published 5y ago modified 4mo ago also EUVD-2020-23930
- cvss
- 7.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Is CVE-2020-36402 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26997 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
github.com
/ethereum/solidity/commit/c39a5e2b7a3fabbf687f53a2823fc087be6c1a7e
patch, third-party-advisory
-
bugs.chromium.org
/p/oss-fuzz/issues/detail?id=26997
exploit, issue-tracking, patch, third-party-advisory
-
github.com
/google/oss-fuzz-vulns/blob/main/vulns/solidity/OSV-2020-2131.yaml
third-party-advisory
Sources
- CVE List CVE-2020-36402
- NVD CVE-2020-36402
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.