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-2013-0166

29
FAUCET Score

CVE-2013-0166 describes a denial-of-service vulnerability in OpenSSL versions prior to 0.9.8y, 1.0.0k, and 1.0.1d, affecting products like openssl and redhat openssl. This flaw allows remote OCSP servers to trigger a NULL pointer dereference and application crash by providing an invalid key during signature verification of OCSP responses. With a CVSS score of 5.0, this vulnerability is of medium severity, requiring no authentication and having a low attack complexity, though its impact is limited to availability. There is no evidence of active exploitation, nor are there any public exploit codes or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
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:*:*:*:*:*:*:*
0.9.4CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.4:*:*:*:*:*:*:*

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
19.65%
Probability of exploitation in next 30 days
EPSS Percentile
97.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1965 is in the 97th 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 5Fixed in: openssl-0:0.9.8e-26.el5_9.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: openssl-0:1.0.0-27.el6_4.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 5.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Enterprise Application Platform 6.1Fixed in: openssl
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Platform 5.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Web Server 2.0Fixed in: openssl
View patch
redhatpatch availablevia redhat_api
Product: RHEV 3.X Hypervisor and Agents for RHEL-6Fixed in: rhev-hypervisor6-0:6.4-20130306.2.el6_4
View patch
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
redhatend of lifevia redhat_api
Product: Red Hat JBoss Enterprise Web Server 1Fixed in: openssl

Vendor Advisories (1)

redhatCVE-2013-0166Moderate

openssl: DoS due to improper handling of OCSP response verification

Feb 5, 2013

References

git.openssl.org / gitweb
git.openssl.org / gitweb
git.openssl.org / gitweb
lists.apple.com / archives/security-announce/2013/Sep/msg00002.html
lists.opensuse.org / opensuse-security-announce/2015-03/msg00027.html
lists.opensuse.org / opensuse-security-announce/2016-03/msg00011.html
marc.info
marc.info
marc.info
rhn.redhat.com / errata/RHSA-2013-0587.html
rhn.redhat.com / errata/RHSA-2013-0782.html
rhn.redhat.com / errata/RHSA-2013-0783.html
rhn.redhat.com / errata/RHSA-2013-0833.html
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/53623
secunia.com / advisories/55108
secunia.com / advisories/55139
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18754
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19081
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19360
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19487
support.hpe.com / hpsc/doc/public/display
support.apple.com / kb/HT5880
debian.org / security/2013/dsa-2621
kb.cert.org / vuls/id/737740
US Government Resource
openssl.org / news/secadv_20130204.txt
Vendor Advisory
splunk.com / view/SP-CAAAHXG