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CVE-2018-21232

20
FAUCET Score

CVE-2018-21232 describes an uncontrolled recursion vulnerability in re2c versions prior to 2.0, specifically within the find_fixed_tags function, leading to stack consumption. This medium-severity vulnerability (CVSS 5.5) requires local access and user interaction, resulting in a high impact on availability but no impact on confidentiality or integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0CPE matchmatch criteria
cpe:2.3:a:re2c:re2c:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.43%
Probability of exploitation in next 30 days
EPSS Percentile
70.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0143 is in the 81st percentile among its peer group of 5,758 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 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 (3)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 16966-16823Fixed in: 2.0-1
microsoftpatch availablevia msrc
Product: cbl2 re2c 2.0-1 on CBL Mariner 2.0Fixed in: 2.0-1

Vendor Advisories (2)

microsoft2020-Apr/CVE-2018-21232Moderate

re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

Apr 14, 2020
redhatCVE-2018-21232Low

re2c: uncontrolled recursion that causes stack consumption in find_fixed_tags

Sep 5, 2018

References

github.com / skvadrik/re2c/issues/219
ExploitPatchThird Party Advisory
openwall.com / lists/oss-security/2020/04/27/2
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2020/05/14/4