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CVE-2008-2420

18
FAUCET Score

CVE-2008-2420 describes a vulnerability in stunnel before version 4.24, where its OCSP functionality fails to correctly search Certificate Revocation Lists (CRLs). This flaw allows remote attackers to bypass access restrictions by presenting revoked certificates, effectively undermining security controls. The vulnerability has a CVSS score of 6.8, indicating a medium severity with potential for partial confidentiality, integrity, and availability impacts, and can be exploited over the network with medium attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.4aCPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:3.4a:*:*:*:*:*:*:*
3.5CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:3.5:*:*:*:*:*:*:*
3.6CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:3.6:*:*:*:*:*:*:*
3.7CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:*
3.8CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.36%
Probability of exploitation in next 30 days
EPSS Percentile
68.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0136 is in the 40th percentile among its peer group of 19,955 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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

Vendor Advisories (1)

redhatCVE-2008-2420Moderate

stunnel: incorrect CRL verification using OCSP protocol

May 19, 2008

References

secunia.com / advisories/30335
Vendor Advisory
secunia.com / advisories/30425
secunia.com / advisories/31438
security.gentoo.org / glsa/glsa-200808-08.xml
exchange.xforce.ibmcloud.com / vulnerabilities/42528
stunnel.mirt.net / pipermail/stunnel-announce/2008-May/000035.html
redhat.com / archives/fedora-package-announce/2008-May/msg00856.html
redhat.com / archives/fedora-package-announce/2008-May/msg00907.html
redhat.com / archives/fedora-package-announce/2008-May/msg00942.html
mandriva.com / security/advisories
securityfocus.com / bid/29309
Patch
vupen.com / english/advisories/2008/1569/references