How severe is CVE-2009-2651?

CVE-2009-2651 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-2651 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2651?

CVE-2009-2651 affects Digium Asterisk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-2651?

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

When was CVE-2009-2651 published?

CVE-2009-2651 was published on 2009-07-30 and last updated on 2026-06-16.

CVE-2009-2651

CVE-2009-2651 is a medium-severity vulnerability in Digium Asterisk 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-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Digium Asterisk
Published: 2009-07-30
Last modified: 2026-06-16

Description

main/rtp.c in Asterisk Open Source 1.6.1 before 1.6.1.2 allows remote attackers to cause a denial of service (crash) via an RTP text frame without a certain delimiter, which triggers a NULL pointer dereference and the subsequent calculation of an invalid pointer.

Frequently asked questions

What is CVE-2009-2651?: main/rtp.c in Asterisk Open Source 1.6.1 before 1.6.1.2 allows remote attackers to cause a denial of service (crash) via an RTP text frame without a certain delimiter, which triggers a NULL pointer dereference and the subsequent calculation of an invalid pointer.
How severe is CVE-2009-2651?: CVE-2009-2651 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-2651 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2651?: CVE-2009-2651 affects Digium Asterisk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-2651?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-2651 published?: CVE-2009-2651 was published on 2009-07-30 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:digium:asterisk:1.6.1:*:*:*:*:*:*:*

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