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CVE-2009-5155

27
FAUCET Score

CVE-2009-5155 is a denial-of-service vulnerability in the GNU C Library (glibc) before version 2.28, affecting products like gnu glibc and NetApp storage solutions. The flaw, residing in the parse_reg_exp function, allows attackers to trigger an assertion failure and application exit or incorrect results by crafting malicious regular expressions. With a CVSS score of 7.5 (High), this vulnerability can be exploited remotely with low attack complexity, leading to a complete loss of availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.28CPE matchmatch criteria
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:netapp:cloud_backup:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.91%
Probability of exploitation in next 30 days
EPSS Percentile
89.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0391 is in the 81st 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

Vendor Patches (3)

redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: glibc
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: glibc
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: glibc

Vendor Advisories (1)

redhatCVE-2009-5155Moderate

glibc: parse_reg_exp in posix/regcomp.c misparses alternatives leading to denial of service or trigger incorrect result

Mar 20, 2019

References

git.savannah.gnu.org / cgit/gnulib.git/commit
Mailing ListPatchVendor Advisory
debbugs.gnu.org / cgi/bugreport.cgi
Mailing ListVendor Advisory
debbugs.gnu.org / cgi/bugreport.cgi
ExploitMailing ListVendor Advisory
debbugs.gnu.org / cgi/bugreport.cgi
ExploitMailing ListVendor Advisory
lists.apache.org / thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
lists.apache.org / thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
security.netapp.com / advisory/ntap-20190315-0002
PatchThird Party Advisory
sourceware.org / bugzilla/show_bug.cgi
ExploitIssue TrackingThird Party Advisory
sourceware.org / bugzilla/show_bug.cgi
ExploitIssue TrackingThird Party Advisory
sourceware.org / git/gitweb.cgi
support.f5.com / csp/article/K64119434
support.f5.com / csp/article/K64119434