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CVE-2011-4576

24
FAUCET Score

CVE-2011-4576 describes a vulnerability in OpenSSL's SSL 3.0 implementation, affecting versions before 0.9.8s and 1.x before 1.0.0f. The flaw stems from improper initialization of data structures for block cipher padding, potentially allowing remote attackers to decrypt padding data and obtain sensitive information. This vulnerability has a CVSS score of 5.0, indicating a medium severity with a network attack vector, low complexity, and a potential impact of partial confidentiality loss. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.9.8rCPE 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:*:*:*:*:*:*:*
0.9.4CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.4:*:*:*:*:*:*:*
0.9.5CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

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

Exploit Intelligence

EPSS Score
14.52%
Probability of exploitation in next 30 days
EPSS Percentile
96.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1452 is in the 96th percentile among its peer group of 23,701 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 (10)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: openssl-0:0.9.7a-43.18.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl-0:0.9.8e-20.el5_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl-0:1.0.0-20.el6_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 5.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 6.0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 1.0
View patch
redhatpatch availablevia redhat_api
Product: RHEV 3.X Hypervisor and Agents for RHEL-6Fixed in: rhev-hypervisor6-0:6.2-20120209.0.el6_2
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: openssl096b
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: openssl097a
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl098e

Vendor Advisories (1)

redhatCVE-2011-4576Moderate

openssl: uninitialized SSL 3.0 padding

Jan 4, 2012

References

aix.software.ibm.com / aix/efixes/security/openssl_advisory3.asc
h20000.www2.hp.com / bizsupport/TechSupport/Document.jsp
lists.apple.com / archives/security-announce/2013/Jun/msg00000.html
lists.fedoraproject.org / pipermail/package-announce/2012-November/092905.html
lists.opensuse.org / opensuse-security-announce/2012-01/msg00017.html
lists.opensuse.org / opensuse-security-announce/2012-01/msg00018.html
marc.info
marc.info
marc.info
rhn.redhat.com / errata/RHSA-2012-1306.html
rhn.redhat.com / errata/RHSA-2012-1307.html
rhn.redhat.com / errata/RHSA-2012-1308.html
secunia.com / advisories/48528
secunia.com / advisories/55069
secunia.com / advisories/57353
support.apple.com / kb/HT5784
www-01.ibm.com / support/docview.wss
debian.org / security/2012/dsa-2390
kb.cert.org / vuls/id/737740
US Government Resource
mandriva.com / security/advisories
mandriva.com / security/advisories
openssl.org / news/secadv_20120104.txt
Vendor Advisory