THREATPORT/VULNERABILITY/CVE-2019-18976
HIGH SEVERITY

CVE-2019-18976

Asterisk vulnerability

CVSS
7.5
EPSS
6.7%
EPSS pct
93th
Exploited
No known
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.
Affected vendor
Digium
Affected product
Asterisk
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-476 — NULL Pointer Dereference
Published
2019-11-22

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 6.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2019-18976

  • Confirm whether Digium Asterisk is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-18976.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-18976

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-18976 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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