How severe is CVE-2008-0891?

CVE-2008-0891 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2008-0891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-0891?

CVE-2008-0891 primarily affects Openssl. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-0891?

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

When was CVE-2008-0891 published?

CVE-2008-0891 was published on 2008-05-29 and last updated on 2026-06-16.

CVE-2008-0891

CVE-2008-0891 is a medium-severity vulnerability in Openssl with a CVSS 2.0 base score of 4.3. 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-189.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 5% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Openssl
Published: 2008-05-29
Last modified: 2026-06-16

Description

Double free vulnerability in OpenSSL 0.9.8f and 0.9.8g, when the TLS server name extensions are enabled, allows remote attackers to cause a denial of service (crash) via a malformed Client Hello packet. NOTE: some of these details are obtained from third party information.

Frequently asked questions

What is CVE-2008-0891?: Double free vulnerability in OpenSSL 0.9.8f and 0.9.8g, when the TLS server name extensions are enabled, allows remote attackers to cause a denial of service (crash) via a malformed Client Hello packet. NOTE: some of these details are obtained from third party information.
How severe is CVE-2008-0891?: CVE-2008-0891 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2008-0891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-0891?: CVE-2008-0891 primarily affects Openssl. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-0891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-0891 published?: CVE-2008-0891 was published on 2008-05-29 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:openssl:openssl:0.9.8f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8g:*:*:*:*:*:*:*

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