How severe is CVE-2008-1637?

CVE-2008-1637 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2008-1637 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-2008-1637?

CVE-2008-1637 affects Powerdns Recursor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2008-1637?

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

When was CVE-2008-1637 published?

CVE-2008-1637 was published on 2008-04-02 and last updated on 2026-06-16.

CVE-2008-1637

CVE-2008-1637 is a medium-severity vulnerability in Powerdns Recursor with a CVSS 2.0 base score of 6.8. 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: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Powerdns Recursor
Published: 2008-04-02
Last modified: 2026-06-16

Description

PowerDNS Recursor before 3.1.5 uses insufficient randomness to calculate (1) TRXID values and (2) UDP source port numbers, which makes it easier for remote attackers to poison a DNS cache, related to (a) algorithmic deficiencies in rand and random functions in external libraries, (b) use of a 32-bit seed value, and (c) choice of the time of day as the sole seeding information.

Frequently asked questions

What is CVE-2008-1637?: PowerDNS Recursor before 3.1.5 uses insufficient randomness to calculate (1) TRXID values and (2) UDP source port numbers, which makes it easier for remote attackers to poison a DNS cache, related to (a) algorithmic deficiencies in rand and random functions in external libraries, (b) use of a 32-bit seed value, and (c) choice of the time of day as the sole seeding information.
How severe is CVE-2008-1637?: CVE-2008-1637 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2008-1637 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-2008-1637?: CVE-2008-1637 affects Powerdns Recursor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2008-1637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-1637 published?: CVE-2008-1637 was published on 2008-04-02 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*

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