How severe is CVE-2009-0041?

CVE-2009-0041 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-0041 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0041?

CVE-2009-0041 primarily affects Asterisk Asterisk Business Edition. In total, 150 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0041?

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

When was CVE-2009-0041 published?

CVE-2009-0041 was published on 2009-01-14 and last updated on 2026-06-16.

CVE-2009-0041

CVE-2009-0041 is a medium-severity vulnerability in Asterisk Asterisk Business Edition with a CVSS 2.0 base score of 5.0. 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: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Asterisk Asterisk Business Edition
Published: 2009-01-14
Last modified: 2026-06-16

Description

IAX2 in Asterisk Open Source 1.2.x before 1.2.31, 1.4.x before 1.4.23-rc4, and 1.6.x before 1.6.0.3-rc2; Business Edition A.x.x, B.x.x before B.2.5.7, C.1.x.x before C.1.10.4, and C.2.x.x before C.2.1.2.1; and s800i 1.2.x before 1.3.0 responds differently to a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.

Frequently asked questions

What is CVE-2009-0041?: IAX2 in Asterisk Open Source 1.2.x before 1.2.31, 1.4.x before 1.4.23-rc4, and 1.6.x before 1.6.0.3-rc2; Business Edition A.x.x, B.x.x before B.2.5.7, C.1.x.x before C.1.10.4, and C.2.x.x before C.2.1.2.1; and s800i 1.2.x before 1.3.0 responds differently to a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.
How severe is CVE-2009-0041?: CVE-2009-0041 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-0041 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0041?: CVE-2009-0041 primarily affects Asterisk Asterisk Business Edition. In total, 150 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0041?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0041 published?: CVE-2009-0041 was published on 2009-01-14 and last updated on 2026-06-16.

References

Affected products (150)

cpe:2.3:a:asterisk:asterisk_business_edition:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:*:beta8:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:a:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.1.3.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.4:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.5:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.3.6:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:b.2.5.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:asterisk_business_edition:c.1.0:beta7:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:*:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:*:rc3:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:*:rc1:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0:beta1:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0:beta2:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0:rc2:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0beta1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.0beta2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.2:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.3:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.10:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.10:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.11:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.11:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.12:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.12:netsec:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.12.1:*:*:*:*:*:*:*
cpe:2.3:a:asterisk:open_source:1.2.12.1:netsec:*:*:*:*:*:*

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