Security readout for executives and security teams
Plain-English summary
This vulnerability can let a remote attacker crash affected Asterisk systems by abusing DNS SRV or NAPTR lookup responses. For organizations relying on Asterisk for voice services, the primary concern is service outage, not proven data theft or code execution based on the supplied sources.
Executive priority
Treat this as a practical availability risk for voice infrastructure. Patch exposed or critical Asterisk systems promptly, especially where downtime affects customer support, sales, emergency operations, or internal communications.
Technical view
CVE-2018-19278 is a buffer overflow in Digium Asterisk 15.x before 15.6.2 and 16.x before 16.0.1. The issue occurs during DNS SRV and NAPTR lookups when buffer sizing uses compressed DNS length instead of expanded length, enabling a crafted DNS response to crash Asterisk.
Likely exposure
Exposure is most likely on Asterisk 15.x before 15.6.2 or 16.x before 16.0.1 where DNS SRV or NAPTR lookups are used. The supplied sources do not identify affected configurations beyond those versions and lookup types.
Exploitation context
The source bundle says remote attackers can crash Asterisk with a specially crafted DNS SRV or NAPTR response. It does not cite active exploitation, public weaponization, or CISA KEV listing, so exploitation status should be treated as unconfirmed.
Researcher notes
The provided record lacks CVSS, CWE, and detailed affected CPE data. Analysis is therefore limited to the stated Asterisk version ranges, DNS SRV/NAPTR lookup path, and crash impact. No source in the bundle supports claims of code execution or active exploitation.
Mitigation direction
- Upgrade Asterisk 15.x to 15.6.2 or later.
- Upgrade Asterisk 16.x to 16.0.1 or later.
- Review AST-2018-010 for vendor-specific operational guidance.
- Prioritize systems providing business-critical voice or call-routing services.
Validation and detection
- Inventory Asterisk versions across production and backup voice systems.
- Confirm no 15.x systems are below 15.6.2.
- Confirm no 16.x systems are below 16.0.1.
- Identify systems using DNS SRV or NAPTR lookups.
- Check service logs for unexplained Asterisk crashes around DNS lookup activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-19278 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://downloads.asterisk.org/pub/security/AST-2018-010.htmlCVE reference · x_refsource_MISC
- https://issues.asterisk.org/jira/browse/ASTERISK-28127CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.