CVE-2021-27343 json
SerenityOS Unspecified is affected by: Buffer Overflow.
published 5y ago modified 4mo ago also EUVD-2021-14103
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
Summary
SerenityOS Unspecified is affected by: Buffer Overflow. The impact is: obtain sensitive information (context-dependent). The component is: /Userland/Libraries/LibCrypto/ASN1/DER.h Crypto::der_decode_sequence() function. The attack vector is: Parsing RSA Key ASN.1.
Patch / fix
- github.com/SerenityOS/serenity@48fbf6a commit
- github.com/SerenityOS/serenity#5344 pull request
Is CVE-2021-27343 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
1.67% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-120 Buffer Copy without Checking Size of Input
References
-
github.com
/SerenityOS/serenity/pull/5344
third-party-advisory
-
github.com
/SerenityOS/serenity/commit/48fbf6a88d4822a1e5470cf08f29464511bd72c1
patch, third-party-advisory
-
github.com
/SerenityOS/serenity/issues/5317
third-party-advisory
Sources
- CVE List CVE-2021-27343
- NVD CVE-2021-27343
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.