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CVE-2021-4110

26
FAUCET Score

CVE-2021-4110 describes a NULL Pointer Dereference vulnerability affecting mruby, a lightweight implementation of the Ruby language. This flaw carries a CVSSv3.1 score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, leading to a high impact on availability. While no public exploit code, Metasploit modules, or Nuclei templates are currently available, and there is minimal community discussion or media coverage, the potential for denial-of-service attacks remains.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1CPE matchmatch criteria
cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.1CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.62%
Probability of exploitation in next 30 days
EPSS Percentile
73.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0162 is in the 56th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / mruby/mruby/commit/f5e10c5a79a17939af763b1dcf5232ce47e24a34
PatchThird Party Advisory
huntr.dev / bounties/4ce5dc47-2512-4c87-8609-453adc8cad20
ExploitPatchThird Party Advisory