CVE-2007-3377

CVE-2007-3377 is a medium-severity vulnerability in Nlnet Labs Net Dns 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.

Key facts

Description

Header.pm in Net::DNS before 0.60, a Perl module, (1) generates predictable sequence IDs with a fixed increment and (2) can use the same starting ID for all child processes of a forking server, which allows remote attackers to spoof DNS responses, as originally reported for qpsmtp and spamassassin.

Frequently asked questions

What is CVE-2007-3377?
Header.pm in Net::DNS before 0.60, a Perl module, (1) generates predictable sequence IDs with a fixed increment and (2) can use the same starting ID for all child processes of a forking server, which allows remote attackers to spoof DNS responses, as originally reported for qpsmtp and spamassassin.
How severe is CVE-2007-3377?
CVE-2007-3377 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2007-3377 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3377?
CVE-2007-3377 primarily affects Nlnet Labs Net Dns. In total, 64 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-3377?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-3377 published?
CVE-2007-3377 was published on 2007-06-25 and last updated on 2026-06-16.

References

Affected products (64)