How severe is CVE-2005-0740?

CVE-2005-0740 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2005-0740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-0740?

CVE-2005-0740 primarily affects Openbsd. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-0740?

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

When was CVE-2005-0740 published?

CVE-2005-0740 was published on 2005-01-13 and last updated on 2026-06-16.

CVE-2005-0740

CVE-2005-0740 is a medium-severity vulnerability in Openbsd with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Openbsd
Published: 2005-01-13
Last modified: 2026-06-16

Description

The TCP stack (tcp_input.c) in OpenBSD 3.5 and 3.6 allows remote attackers to cause a denial of service (system panic) via crafted values in the TCP timestamp option, which causes invalid arguments to be used when calculating the retransmit timeout.

Frequently asked questions

What is CVE-2005-0740?: The TCP stack (tcp_input.c) in OpenBSD 3.5 and 3.6 allows remote attackers to cause a denial of service (system panic) via crafted values in the TCP timestamp option, which causes invalid arguments to be used when calculating the retransmit timeout.
How severe is CVE-2005-0740?: CVE-2005-0740 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2005-0740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-0740?: CVE-2005-0740 primarily affects Openbsd. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-0740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2005-0740 published?: CVE-2005-0740 was published on 2005-01-13 and last updated on 2026-06-16.

References

Affected products (17)

cpe:2.3:o:openbsd:openbsd:2.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.1:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.3:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.4:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.5:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.6:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.7:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.8:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:2.9:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.0:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.1:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.2:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.3:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.4:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.5:*:*:*:*:*:*:*
cpe:2.3:o:openbsd:openbsd:3.6:*:*:*:*:*:*:*

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