HOMEVULNERABILITIESCVE-2009-5155
HIGH

CVE-2009-5155

CWE-19Published: February 26, 2019· Updated: Jun 16, 2026

7.5
CVSS v3.1

Official Description

In the GNU C Library (aka glibc or libc6) before 2.28, parse_reg_exp in posix/regcomp.c misparses alternatives, which allows attackers to cause a denial of service (assertion failure and application exit) or trigger an incorrect result by attempting a regular-expression match.

NVD Source

Technical Analysis

CVE-2009-5155 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

gnu1 product(s)
glibc
netapp3 product(s)
cloud backupontap select deploy administration utilitysteelstore cloud integrated storage
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
PATCHhttps://security.netapp.com/advisory/ntap-20190315-0002/
PATCHhttp://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272
PATCHhttps://security.netapp.com/advisory/ntap-20190315-0002/
ADVISORYhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
ADVISORYhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
ADVISORYhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
ADVISORYhttps://sourceware.org/bugzilla/show_bug.cgi?id=11053
ADVISORYhttps://sourceware.org/bugzilla/show_bug.cgi?id=18986
ADVISORYhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793
ADVISORYhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806
ADVISORYhttps://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238
ADVISORYhttps://sourceware.org/bugzilla/show_bug.cgi?id=11053
ADVISORYhttps://sourceware.org/bugzilla/show_bug.cgi?id=18986

All References (24)

→
http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272Mailing List · Patch · Vendor Advisory
→
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793Mailing List · Vendor Advisory
→
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806Exploit · Mailing List · Vendor Advisory
→
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34238Exploit · Mailing List · Vendor Advisory
→
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
→
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
→
https://security.netapp.com/advisory/ntap-20190315-0002/Patch · Third Party Advisory
→
https://sourceware.org/bugzilla/show_bug.cgi?id=11053Exploit · Issue Tracking · Third Party Advisory
→
https://sourceware.org/bugzilla/show_bug.cgi?id=18986Exploit · Issue Tracking · Third Party Advisory
→
https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=eb04c21373e2a2885f3d52ff192b0499afe3c672
→
https://support.f5.com/csp/article/K64119434
→
https://support.f5.com/csp/article/K64119434?utm_source=f5support&amp%3Butm_medium=RSS
→
http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=5513b40999149090987a0341c018d05d3eea1272Mailing List · Patch · Vendor Advisory
→
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22793Mailing List · Vendor Advisory
→
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32806Exploit · Mailing List · Vendor Advisory

Quick Facts

CVE IDCVE-2009-5155
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-19
CISA KEVNo
Affected2 vendor(s)
PublishedFeb 26, 2019

Related CVEs (CWE-19)

CVE-1999-0226
10.0
CVE-2014-8817
10.0
CVE-2015-2373
10.0
CVE-2014-4488
10.0
CVE-2014-7247
10.0
CVE-2014-8822
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2009-5155 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2009-5155·NVD