CVE-2021-4110 json
NULL Pointer Dereference in mruby/mruby
published 2021-12-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33991
- cvss
- 9.1
- version 3.0, CNA
- 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
mruby is vulnerable to NULL Pointer Dereference
Patch / fix
- mruby mruby/mruby 3.1
- mruby Debian 14, Debian 13, Debian 12 3.0.0-2
debian advisories DEBIAN-CVE-2021-4110
- mruby openSUSE Tumbleweed 3.0.0-2.1
opensuse advisories openSUSE-SU-2024:11684-1
- mruby Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 3.1.0-r0
alpine advisories ALPINE-CVE-2021-4110
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Exploit prediction
1.69% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/4ce5dc47-2512-4c87-8609-453adc8cad20 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 9.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- mruby mruby/mruby
Classification
- Weakness
-
- CWE-476 NULL Pointer Dereference
References
-
github.com
/mruby/mruby/commit/f5e10c5a79a17939af763b1dcf5232ce47e24a34
patch, third-party-advisory
-
huntr.dev
/bounties/4ce5dc47-2512-4c87-8609-453adc8cad20
exploit, patch, third-party-advisory
Sources
- CVE List CVE-2021-4110
- NVD CVE-2021-4110
Fencer Vulns 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.