Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2009-4355

23
FAUCET Score

CVE-2009-4355 describes a memory leak in the zlib_stateful_finish function within OpenSSL versions 0.9.8l and earlier, and 1.0.0 Beta through Beta 4. This flaw allows remote attackers to trigger excessive memory consumption, leading to a denial of service. The vulnerability has a CVSS score of 5.0 (medium severity) with a low attack complexity and no authentication required, but only impacts availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.8lCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
0.9.1cCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.1c:*:*:*:*:*:*:*
0.9.2bCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.2b:*:*:*:*:*:*:*
0.9.3CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.3:*:*:*:*:*:*:*
0.9.3aCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.3a:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
8.94%
Probability of exploitation in next 30 days
EPSS Percentile
94.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0894 is in the 93rd percentile among its peer group of 23,690 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl-0:0.9.8e-12.el5_4.1
View patch
ubuntuvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2009-4355Moderate

openssl significant memory leak in certain SSLv3 requests (DoS)

Jan 13, 2010

References

cvs.openssl.org / chngview
cvs.openssl.org / chngview
cvs.openssl.org / chngview
lists.fedoraproject.org / pipermail/package-announce/2010-April/038587.html
lists.fedoraproject.org / pipermail/package-announce/2010-April/039561.html
lists.opensuse.org / opensuse-security-announce/2010-01/msg00009.html
marc.info
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/38175
Vendor Advisory
secunia.com / advisories/38181
Vendor Advisory
secunia.com / advisories/38200
Vendor Advisory
secunia.com / advisories/38761
secunia.com / advisories/39461
secunia.com / advisories/42724
secunia.com / advisories/42733
issues.rpath.com / browse/RPL-3157
kb.bluecoat.com / index
slackware.com / security/viewer.php
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11260
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12168
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6678
rhn.redhat.com / errata/RHSA-2010-0095.html
wiki.rpath.com / wiki/Advisories:rPSA-2010-0004
debian.org / security/2010/dsa-1970
mandriva.com / security/advisories
openwall.com / lists/oss-security/2010/01/13/3
ubuntu.com / usn/USN-884-1
Vendor Advisory
vupen.com / english/advisories/2010/0124
Vendor Advisory
vupen.com / english/advisories/2010/0839
vupen.com / english/advisories/2010/0916