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CVE-2007-3642

21
FAUCET Score

CVE-2007-3642 is a denial-of-service vulnerability affecting the Linux kernel (versions before 2.6.20.15, 2.6.21.6, and 2.6.22) in the netfilter H.323 connection tracking module. Remote attackers can exploit this by sending a specially crafted, out-of-range index value to the decode_choice function, leading to a NULL pointer dereference and system crash. With a CVSS score of 7.8, this vulnerability is considered high severity due to its network-based attack vector and complete availability impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.6.20.14CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
2.6.0CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.0:*:*:*:*:*:*:*
2.6.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.1:*:*:*:*:*:*:*
2.6.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.1:rc1:*:*:*:*:*:*
2.6.1CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:2.6.1:rc2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.87%
Probability of exploitation in next 30 days
EPSS Percentile
89.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0387 is in the 81st percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2007-3642

CVE-2007-3642

References

git.kernel.org
kernel.org / pub/linux/kernel/v2.6/ChangeLog-2.6.20.15
kernel.org / pub/linux/kernel/v2.6/ChangeLog-2.6.21.6
kernel.org / pub/linux/kernel/v2.6/ChangeLog-2.6.22
osvdb.org / 37117
secunia.com / advisories/25955
PatchVendor Advisory
secunia.com / advisories/26450
Vendor Advisory
secunia.com / advisories/27212
Vendor Advisory
debian.org / security/2007/dsa-1356
mandriva.com / security/advisories
securityfocus.com / bid/24818
ubuntu.com / usn/usn-510-1
vupen.com / english/advisories/2007/2466
Vendor Advisory