stunnel: incorrect CRL verification using OCSP protocol
Published May 23, 2008
6.8
MEDIUMCVSS 2.0
EPSS 1.36%
Description
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.
Affected products
No data.
- 3.4a
- 3.5
- 3.6
- 3.7
- 3.8
- 3.8p1
- 3.8p2
- 3.8p3
- 3.8p4
- 3.9
- 3.10
- 3.11
- 3.12
- 3.13
- 3.14
- 3.15
- 3.16
- 3.17
- 3.18
- 3.19
- 3.20
- 3.21
- 3.21a
- 3.21b
- 3.21c
- 3.22
- 3.23
- 3.24
- 3.25
- 3.26
- 4.00
- 4.01
- 4.02
- 4.03
- 4.04
- 4.05
- 4.06
- 4.07
- 4.08
- 4.09
- 4.10
- 4.11
- 4.12
- 4.13
- 4.14
- 4.15
- 4.16
- 4.17
- 4.18
- 4.19
- 4.20
- 4.21
- 4.22
- 4.23
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
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.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 1.36% (0.01364) | 70.82th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.36% (0.01364) | 68.09th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.49% (0.00488) | 63.37th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.93% (0.01935) | 89.13th | v3 (v2023.03.01) |
| May 29, 2024 | 1.61% (0.01608) | 87.42th | v3 (v2023.03.01) |
| May 9, 2024 | 1.49% (0.01487) | 86.76th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.49% (0.01487) | 84.76th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (16)
- http://secunia.com/advisories/30335 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/30425 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/31438 third-party-advisoryx_refsource_SECUNIA
- http://security.gentoo.org/glsa/glsa-200808-08.xml vendor-advisoryx_refsource_GENTOO
- http://stunnel.mirt.net/pipermail/stunnel-announce/2008-May/000035.html mailing-listx_refsource_MLIST
- http://www.mandriva.com/security/advisories?name=MDVSA-2008:168 vendor-advisoryx_refsource_MANDRIVA
- http://www.securityfocus.com/bid/29309 vdb-entryx_refsource_BIDPatch
- http://www.vupen.com/english/advisories/2008/1569/references vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2008-2420 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=448290 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/42528 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2008-2420
- https://www.cve.org/CVERecord?id=CVE-2008-2420
- https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00856.html vendor-advisoryx_refsource_FEDORA
- https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00907.html vendor-advisoryx_refsource_FEDORA
- https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00942.html vendor-advisoryx_refsource_FEDORA
Change history (0)
No recorded changes yet.