CVE-2010-4051Glibc Vulnerability
The regcomp implementation in the GNU C Library (aka glibc or libc6) through 2.11.3, and 2.12.x through 2.12.2, allows context-dependent attackers to cause a denial of service (application crash) via a regular expression containing adjacent bounded repetitions that bypass the…
Published Jan 13, 2011 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2010-4051
Key Facts
Routine patching- CVE-2010-4051 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Glibc (Gnu), rootio-glibc.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 40% probability of exploitation in the next 30 days.
- Fixed versions are available, including Glibc 2.19-4, rootio-glibc 2.19-4.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Scores
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
40%
Higher than 98.6% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
34/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
5
Reports of active use
Advisories And Exploit References
Description
The regcomp implementation in the GNU C Library (aka glibc or libc6) through 2.11.3, and 2.12.x through 2.12.2, allows context-dependent attackers to cause a denial of service (application crash) via a regular expression containing adjacent bounded repetitions that bypass the intended RE_DUP_MAX limitation, as demonstrated by a {10,}{10,}{10,}{10,}{10,} sequence in the proftpd.gnu.c exploit for ProFTPD, related to a "RE_DUP_MAX overflow."
Affected Products
42 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| GlibcGnu | 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07 | 2.19-4 |
| rootio-glibcrootio | See advisory | 2.19-4 |
Patched Releases
Glibc
2.19-4
rootio-glibc
2.19-4
Timeline
Publicly disclosed
Jan 13, 2011
Last updated
Aug 4, 2026
References
- advisorysecurity-tracker.debian.org · CVE-2010-4051
- advisory42547
- patchcxib.net · proftpd.gnu.c
- exploitbugzilla.redhat.com · show_bug.cgi
- exploit20110107 GNU libc/regcomp(3) Multiple Vulnerabilities
FAQ
Common Questions.
The regcomp implementation in the GNU C Library (aka glibc or libc6) through 2.11.3, and 2.12.x through 2.12.2, allows context-dependent attackers to cause a denial of service (application crash) via a regular expression containing adjacent bounded repetitions that bypass the intended RE_DUP_MAX limitation, as demonst…
Affected: Glibc (Gnu) versions 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07; rootio-glibc. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Glibc 2.19-4, rootio-glibc 2.19-4.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Is CVE-2010-4051 On Your Attack Surface?
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