How severe is CVE-2008-3903?

CVE-2008-3903 has a CVSS 2.0 base score of 3.5, rated low severity.

Is CVE-2008-3903 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-3903?

CVE-2008-3903 primarily affects Asterisk P B X. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-3903?

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

When was CVE-2008-3903 published?

CVE-2008-3903 was published on 2008-09-04 and last updated on 2026-06-16.

CVE-2008-3903

CVE-2008-3903 is a low-severity vulnerability in Asterisk P B X with a CVSS 2.0 base score of 3.5. 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-200.

Key facts

Severity: Low (CVSS 2.0 base score 3.5)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Asterisk P B X
Published: 2008-09-04
Last modified: 2026-06-16

Description

Asterisk Open Source 1.2.x before 1.2.32, 1.4.x before 1.4.24.1, and 1.6.0.x before 1.6.0.8; Asterisk Business Edition A.x.x, B.x.x before B.2.5.8, C.1.x.x before C.1.10.5, and C.2.x.x before C.2.3.3; s800i 1.3.x before 1.3.0.2; and Trixbox PBX 2.6.1, when Digest authentication and authalwaysreject are enabled, generates different responses depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames.

Frequently asked questions

What is CVE-2008-3903?: Asterisk Open Source 1.2.x before 1.2.32, 1.4.x before 1.4.24.1, and 1.6.0.x before 1.6.0.8; Asterisk Business Edition A.x.x, B.x.x before B.2.5.8, C.1.x.x before C.1.10.5, and C.2.x.x before C.2.3.3; s800i 1.3.x before 1.3.0.2; and Trixbox PBX 2.6.1, when Digest authentication and authalwaysreject are enabled, generates different responses depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames.
How severe is CVE-2008-3903?: CVE-2008-3903 has a CVSS 2.0 base score of 3.5, rated low severity.
Is CVE-2008-3903 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-3903?: CVE-2008-3903 primarily affects Asterisk P B X. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-3903?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-3903 published?: CVE-2008-3903 was published on 2008-09-04 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:asterisk:p_b_x:1.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:p_b_x:1.2.22:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:p_b_x:1.4.21.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:p_b_x:1.6:*:*:*:*:*:*:*
cpe:2.3:a:trixbox:pbx:2.6.1:*:*:*:*:*:*:*

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