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    CVE-2008-2420

    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.

    Published:May 19, 2008
    Last Modified:Apr 23, 2026
    EPS:May 23, 2008
    EPSS Score:0.00488
    CVSS Score:6.8

    Affected Products

    Vendor
    Stunnel
    Product
    Stunnel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-70368 (CVSS 6.5) — A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling overs…
    CVE-2026-70367 (CVSS 5.4) — A Server-Side Request Forgery (SSRF) bypass vulnerability exists in “stunnel” 5.79 and lower when configured i…
    CVE-2021-20230 (CVSS 7.5) — A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configur…
    CVE-2015-3644 (CVSS 5.8) — Stunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expecte…
    CVE-2014-0016 (CVSS 4.3) — stunnel before 5.00, when using fork threading, does not properly update the state of the OpenSSL pseudo-rando…
    CVE-2013-1762 (CVSS 6.6) — stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not cor…
    CVE-2011-2940 (CVSS 9.3) — stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (hea…
    CVE-2008-2400 (CVSS 7.2) — Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to …
    CVE-2003-0740 (CVSS 4.6) — Stunnel 4.00, and 3.24 and earlier, leaks a privileged file descriptor returned by listen(), which allows loca…
    CVE-2003-0147 (CVSS 5) — OpenSSL does not use RSA blinding by default, which allows local and remote attackers to obtain the server's p…

    References

    http://secunia.com/advisories/30335
    http://secunia.com/advisories/30425
    http://secunia.com/advisories/31438
    http://security.gentoo.org/glsa/glsa-200808-08.xml
    http://stunnel.mirt.net/pipermail/stunnel-announce/2008-May/000035.html
    http://www.mandriva.com/security/advisories?name=MDVSA-2008:168
    http://www.securityfocus.com/bid/29309
    http://www.vupen.com/english/advisories/2008/1569/references
    https://exchange.xforce.ibmcloud.com/vulnerabilities/42528
    https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00856.html
    https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00907.html
    https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00942.html
    http://secunia.com/advisories/30335
    http://secunia.com/advisories/30425
    http://secunia.com/advisories/31438
    http://security.gentoo.org/glsa/glsa-200808-08.xml
    http://stunnel.mirt.net/pipermail/stunnel-announce/2008-May/000035.html
    http://www.mandriva.com/security/advisories?name=MDVSA-2008:168
    http://www.securityfocus.com/bid/29309
    http://www.vupen.com/english/advisories/2008/1569/references
    https://exchange.xforce.ibmcloud.com/vulnerabilities/42528
    https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00856.html
    https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00907.html
    https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00942.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High