How severe is CVE-2004-0257?

CVE-2004-0257 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2004-0257 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0257?

CVE-2004-0257 primarily affects Netbsd. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0257?

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

When was CVE-2004-0257 published?

CVE-2004-0257 was published on 2004-11-23 and last updated on 2026-06-16.

CVE-2004-0257

CVE-2004-0257 is a medium-severity vulnerability in Netbsd 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% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Netbsd
Published: 2004-11-23
Last modified: 2026-06-16

Description

OpenBSD 3.4 and NetBSD 1.6 and 1.6.1 allow remote attackers to cause a denial of service (crash) by sending an IPv6 packet with a small MTU to a listening port and then issuing a TCP connect to that port.

Frequently asked questions

What is CVE-2004-0257?: OpenBSD 3.4 and NetBSD 1.6 and 1.6.1 allow remote attackers to cause a denial of service (crash) by sending an IPv6 packet with a small MTU to a listening port and then issuing a TCP connect to that port.
How severe is CVE-2004-0257?: CVE-2004-0257 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2004-0257 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0257?: CVE-2004-0257 primarily affects Netbsd. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0257?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0257 published?: CVE-2004-0257 was published on 2004-11-23 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:o:netbsd:netbsd:1.6:*:*:*:*:*:*:*
cpe:2.3:o:netbsd:netbsd:1.6.1:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

More vulnerabilities in Netbsd

CVE-2006-4304 — Critical (CVSS 10.0): Buffer overflow in the sppp driver in FreeBSD 4.11 through 6.1, NetBSD 2.0 through 4.0 beta before 20060823, and…
CVE-2003-0694 — Critical (CVSS 10.0): The prescan function in Sendmail 8.12.9 allows remote attackers to execute arbitrary code via buffer overflow attacks,…
CVE-2002-1337 — Critical (CVSS 10.0): Buffer overflow in Sendmail 5.79 to 8.12.7 allows remote attackers to execute arbitrary code via certain formatted…
CVE-2001-0554 — Critical (CVSS 10.0): Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows remote attackers to execute…
CVE-2001-0247 — Critical (CVSS 10.0): Buffer overflows in BSD-based FTP servers allows remote attackers to execute arbitrary commands via a long pattern…
CVE-2001-0053 — Critical (CVSS 10.0): One-byte buffer overflow in replydirname function in BSD-based ftpd allows remote attackers to gain root privileges.

All CVEs affecting Netbsd →