Is CVE-2011-1175 in the CISA KEV catalog?

No. CVE-2011-1175 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-1175?

CVE-2011-1175 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-1175?

CVE-2011-1175 has an EPSS score of 2.72% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-1175?

Upgrade asterisk on debian 11 to 1:1.8.3.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-1175

MEDIUMEPSS 84th pctl

5.0

CVSS v2

NVD

Description

tcptls.c in the TCP/TLS server in Asterisk Open Source 1.6.1.x before 1.6.1.23, 1.6.2.x before 1.6.2.17.1, and 1.8.x before 1.8.3.1 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) by establishing many short TCP sessions to services that use a certain TLS API.

How to fix

Remediation Available

asteriskDebian

Fixed in:1:1.8.3.3-1CVE-2011-1175

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.72%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch3

Vendor Advisory2

Other references8

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.