How severe is CVE-2011-1507?

CVE-2011-1507 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-1507 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-2011-1507?

CVE-2011-1507 primarily affects Digium Asterisk. In total, 223 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1507?

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

When was CVE-2011-1507 published?

CVE-2011-1507 was published on 2011-04-27 and last updated on 2026-06-16.

CVE-2011-1507

CVE-2011-1507 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: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Digium Asterisk
Published: 2011-04-27
Last modified: 2026-06-16

Description

Asterisk Open Source 1.4.x before 1.4.40.1, 1.6.1.x before 1.6.1.25, 1.6.2.x before 1.6.2.17.3, and 1.8.x before 1.8.3.3 and Asterisk Business Edition C.x.x before C.3.6.4 do not restrict the number of unauthenticated sessions to certain interfaces, which allows remote attackers to cause a denial of service (file descriptor exhaustion and disk space exhaustion) via a series of TCP connections.

Frequently asked questions

What is CVE-2011-1507?: Asterisk Open Source 1.4.x before 1.4.40.1, 1.6.1.x before 1.6.1.25, 1.6.2.x before 1.6.2.17.3, and 1.8.x before 1.8.3.3 and Asterisk Business Edition C.x.x before C.3.6.4 do not restrict the number of unauthenticated sessions to certain interfaces, which allows remote attackers to cause a denial of service (file descriptor exhaustion and disk space exhaustion) via a series of TCP connections.
How severe is CVE-2011-1507?: CVE-2011-1507 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-1507 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-2011-1507?: CVE-2011-1507 primarily affects Digium Asterisk. In total, 223 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1507?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1507 published?: CVE-2011-1507 was published on 2011-04-27 and last updated on 2026-06-16.

References

Affected products (223)

cpe:2.3:a:digium:asterisk:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.0:beta2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.0:beta3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.0:beta4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.10:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.10.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.11:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.12:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.12.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.13:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.14:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.15:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.16:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.16.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.16.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.17:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.18:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19:rc3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19:rc4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.19.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.20:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.20:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.20:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.20:rc3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.20.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.21:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.21:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.21:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.21.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.21.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.22:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.4.22:rc1:*:*:*:*:*:*

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