CVE-2019-18976

HIGHEPSS 96th pctl

7.5

CVSS v3

Description

An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

asteriskDebian

Fixed in:1:16.1.1~dfsg-1CVE-2019-18976

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

12.79%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory4

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	93%	-	Fix
CVE-2023-21547	High	7.5	89%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

Common questions

How do I fix CVE-2019-18976?

Upgrade asterisk on debian unstable to 1:16.1.1~dfsg-1 or later.

Is CVE-2019-18976 being actively exploited?

Not that we know of. CVE-2019-18976 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 12.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 96% of all scored CVEs.

How severe is CVE-2019-18976?

CVE-2019-18976 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2019-18976 affect?

Published advisories record a fix for asterisk (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2024-11-21.