How severe is CVE-2007-3642?

CVE-2007-3642 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2007-3642 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3642?

CVE-2007-3642 primarily affects Linux Linux Kernel. In total, 241 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-3642?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2007-3642 published?

CVE-2007-3642 was published on 2007-07-10 and last updated on 2026-06-16.

CVE-2007-3642

CVE-2007-3642 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 7.8. 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-189.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Linux Linux Kernel
Published: 2007-07-10
Last modified: 2026-06-16

Description

The decode_choice function in net/netfilter/nf_conntrack_h323_asn1.c in the Linux kernel before 2.6.20.15, 2.6.21.x before 2.6.21.6, and before 2.6.22 allows remote attackers to cause a denial of service (crash) via an encoded, out-of-range index value for a choice field, which triggers a NULL pointer dereference.

Frequently asked questions

What is CVE-2007-3642?: The decode_choice function in net/netfilter/nf_conntrack_h323_asn1.c in the Linux kernel before 2.6.20.15, 2.6.21.x before 2.6.21.6, and before 2.6.22 allows remote attackers to cause a denial of service (crash) via an encoded, out-of-range index value for a choice field, which triggers a NULL pointer dereference.
How severe is CVE-2007-3642?: CVE-2007-3642 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2007-3642 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3642?: CVE-2007-3642 primarily affects Linux Linux Kernel. In total, 241 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-3642?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2007-3642 published?: CVE-2007-3642 was published on 2007-07-10 and last updated on 2026-06-16.

References

Affected products (241)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.0:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.2:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.2:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.2:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.3:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.3:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.3:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.3:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.4:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.4:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.4:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.5:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.5:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.5:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.6:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.6:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.6:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.7:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.7:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.7:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.8:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.8:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.8:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.8:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.8.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.9:rc2:*:*:*:*:*:*

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