How severe is CVE-2009-0871?

CVE-2009-0871 has a CVSS 2.0 base score of 3.5, rated low severity.

Is CVE-2009-0871 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0871?

CVE-2009-0871 primarily affects Digium Asterisk. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0871?

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

When was CVE-2009-0871 published?

CVE-2009-0871 was published on 2009-03-11 and last updated on 2026-06-16.

CVE-2009-0871

CVE-2009-0871 is a low-severity vulnerability in Digium Asterisk 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-20.

Key facts

Severity: Low (CVSS 2.0 base score 3.5)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Digium Asterisk
Published: 2009-03-11
Last modified: 2026-06-16

Description

The SIP channel driver in Asterisk Open Source 1.4.22, 1.4.23, and 1.4.23.1; 1.6.0 before 1.6.0.6; 1.6.1 before 1.6.1.0-rc2; and Asterisk Business Edition C.2.3, with the pedantic option enabled, allows remote authenticated users to cause a denial of service (crash) via a SIP INVITE request without any headers, which triggers a NULL pointer dereference in the (1) sip_uri_headers_cmp and (2) sip_uri_params_cmp functions.

Frequently asked questions

What is CVE-2009-0871?: The SIP channel driver in Asterisk Open Source 1.4.22, 1.4.23, and 1.4.23.1; 1.6.0 before 1.6.0.6; 1.6.1 before 1.6.1.0-rc2; and Asterisk Business Edition C.2.3, with the pedantic option enabled, allows remote authenticated users to cause a denial of service (crash) via a SIP INVITE request without any headers, which triggers a NULL pointer dereference in the (1) sip_uri_headers_cmp and (2) sip_uri_params_cmp functions.
How severe is CVE-2009-0871?: CVE-2009-0871 has a CVSS 2.0 base score of 3.5, rated low severity.
Is CVE-2009-0871 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0871?: CVE-2009-0871 primarily affects Digium Asterisk. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0871?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0871 published?: CVE-2009-0871 was published on 2009-03-11 and last updated on 2026-06-16.

References

Affected products (30)

cpe:2.3:a:digium:asterisk:1.4.22:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.23:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.23.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta5:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta6:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta7:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta7.1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta8:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:beta9:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:rc4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:rc5:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0:rc6:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0.3:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0.3:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0.4:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.0.5:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.1:beta1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.1:beta2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.1:beta3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.1:beta4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.6.1:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:c.2.3:-:business:*:*:*:*:*

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