How severe is CVE-2008-2420?

CVE-2008-2420 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2008-2420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-2420?

CVE-2008-2420 primarily affects Stunnel. In total, 54 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-2420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2008-2420 published?

CVE-2008-2420 was published on 2008-05-23 and last updated on 2026-06-16.

CVE-2008-2420

CVE-2008-2420 is a medium-severity vulnerability in Stunnel with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Stunnel
Published: 2008-05-23
Last modified: 2026-06-16

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.

Frequently asked questions

What is 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.
How severe is CVE-2008-2420?: CVE-2008-2420 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2008-2420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-2420?: CVE-2008-2420 primarily affects Stunnel. In total, 54 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-2420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-2420 published?: CVE-2008-2420 was published on 2008-05-23 and last updated on 2026-06-16.

References

Affected products (54)

cpe:2.3:a:stunnel:stunnel:3.4a:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.5:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.6:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.7:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.8:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.8p1:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.8p2:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.8p3:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.8p4:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.9:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.10:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.11:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.12:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.13:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.14:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.15:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.16:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.17:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.18:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.19:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.20:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.21:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.21a:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.21b:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.21c:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.22:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.23:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.24:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.25:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:3.26:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.00:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.01:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.02:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.03:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.05:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.06:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.07:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.08:*:*:*:*:*:*:*
cpe:2.3:a:stunnel:stunnel:4.09:*:*:*:*:*:*:*

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