Mission and Overview
NVD is the U.S. government repository of standards based vulnerability management data. This data enables automation of vulnerability management, security measurement, and compliance (e.g. FISMA).
Resource Status
NVD contains:

Last updated: 12/28/2014 7:26:21 PM

CVE Publication rate: 17.47

Email List

NVD provides four mailing lists to the public. For information and subscription instructions please visit NVD Mailing Lists

Workload Index
Vulnerability Workload Index: 7.1
About Us
NVD is a product of the NIST Computer Security Division and is sponsored by the Department of Homeland Security's National Cyber Security Division. It supports the U.S. government multi-agency (OSD, DHS, NSA, DISA, and NIST) Information Security Automation Program. It is the U.S. government content repository for the Security Content Automation Protocol (SCAP).

National Cyber Awareness System

Vulnerability Summary for CVE-2008-2420

Original release date: 05/23/2008
Last revised: 03/07/2011


The OCSP functionality in stunnel before 4.24 does not properly search certificate revocation lists (CRL), which allows remote attackers to bypass intended access restrictions by using revoked certificates.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 6.8 (MEDIUM) (AV:N/AC:M/Au:N/C:P/I:P/A:P) (legend)
Impact Subscore: 6.4
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (05/26/2008)
Not vulnerable. OCSP protocol support was only implemented in upstream stunnel version 4.16. Therefore OCSP protocol is not available in the versions of stunnel as shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

External Source: FEDORA
Name: FEDORA-2008-4579
External Source: BID
Name: 29309
Type: Patch Information
External Source: MANDRIVA
Name: MDVSA-2008:168
External Source: SECUNIA
Name: 30425
External Source: FEDORA
Name: FEDORA-2008-4606
External Source: GENTOO
Name: GLSA-200808-08
External Source: XF
Name: stunnel-ocsp-security-bypass(42528)
External Source: FEDORA
Name: FEDORA-2008-4531
External Source: SECUNIA
Name: 31438
External Source: VUPEN
Name: ADV-2008-1569
External Source: MLIST
Name: [stunnel-announce] 20080519 stunnel 4.24 released
External Source: SECUNIA
Name: 30335
Type: Advisory

Vulnerable software and versions

+ Configuration 1
+ OR
* cpe:/a:stunnel:stunnel:3.10
* cpe:/a:stunnel:stunnel:3.11
* cpe:/a:stunnel:stunnel:3.12
* cpe:/a:stunnel:stunnel:3.13
* cpe:/a:stunnel:stunnel:3.14
* cpe:/a:stunnel:stunnel:3.15
* cpe:/a:stunnel:stunnel:3.16
* cpe:/a:stunnel:stunnel:3.17
* cpe:/a:stunnel:stunnel:3.18
* cpe:/a:stunnel:stunnel:3.19
* cpe:/a:stunnel:stunnel:3.20
* cpe:/a:stunnel:stunnel:3.21
* cpe:/a:stunnel:stunnel:3.21a
* cpe:/a:stunnel:stunnel:3.21b
* cpe:/a:stunnel:stunnel:3.21c
* cpe:/a:stunnel:stunnel:3.22
* cpe:/a:stunnel:stunnel:3.23
* cpe:/a:stunnel:stunnel:3.24
* cpe:/a:stunnel:stunnel:3.25
* cpe:/a:stunnel:stunnel:3.26
* cpe:/a:stunnel:stunnel:3.4a
* cpe:/a:stunnel:stunnel:3.5
* cpe:/a:stunnel:stunnel:3.6
* cpe:/a:stunnel:stunnel:3.7
* cpe:/a:stunnel:stunnel:3.8
* cpe:/a:stunnel:stunnel:3.8p1
* cpe:/a:stunnel:stunnel:3.8p2
* cpe:/a:stunnel:stunnel:3.8p3
* cpe:/a:stunnel:stunnel:3.8p4
* cpe:/a:stunnel:stunnel:3.9
* cpe:/a:stunnel:stunnel:4.00
* cpe:/a:stunnel:stunnel:4.01
* cpe:/a:stunnel:stunnel:4.02
* cpe:/a:stunnel:stunnel:4.03
* cpe:/a:stunnel:stunnel:4.04
* cpe:/a:stunnel:stunnel:4.05
* cpe:/a:stunnel:stunnel:4.06
* cpe:/a:stunnel:stunnel:4.07
* cpe:/a:stunnel:stunnel:4.08
* cpe:/a:stunnel:stunnel:4.09
* cpe:/a:stunnel:stunnel:4.10
* cpe:/a:stunnel:stunnel:4.11
* cpe:/a:stunnel:stunnel:4.12
* cpe:/a:stunnel:stunnel:4.13
* cpe:/a:stunnel:stunnel:4.14
* cpe:/a:stunnel:stunnel:4.15
* cpe:/a:stunnel:stunnel:4.16
* cpe:/a:stunnel:stunnel:4.17
* cpe:/a:stunnel:stunnel:4.18
* cpe:/a:stunnel:stunnel:4.19
* cpe:/a:stunnel:stunnel:4.20
* cpe:/a:stunnel:stunnel:4.21
* cpe:/a:stunnel:stunnel:4.22
* cpe:/a:stunnel:stunnel:4.23

* Denotes Vulnerable Software
Changes related to vulnerability configurations

Technical Details

Vulnerability Type (View All)
  • Permissions, Privileges, and Access Control (CWE-264)