Security readout for executives and security teams
Plain-English summary
CVE-2019-12678 can crash Cisco ASA or FTD security devices when they incorrectly parse a malicious SIP packet passing through the device. The business risk is loss of firewall or gateway availability, potentially disrupting voice or network services. The provided sources do not state active exploitation or affected version ranges.
Executive priority
Treat as high priority where Cisco ASA or FTD devices support critical network or voice paths. The issue affects availability, not data theft, but a crash of a security gateway can cause business disruption.
Technical view
The Cisco SIP inspection module improperly parses SIP messages. A remote unauthenticated attacker can trigger an integer underflow, causing an unmapped memory read and device crash. CVSS 3.0 is 8.6: network reachable, low complexity, no privileges, no user interaction, changed scope, and high availability impact.
Likely exposure
Likely exposure is Cisco ASA Software or Cisco FTD Software deployments processing SIP traffic through affected devices. The source bundle does not provide exact affected versions, configurations, or CPEs.
Exploitation context
The sources describe remote unauthenticated denial of service via a malicious SIP packet sent through an affected device. CISA KEV is false in the bundle, and no cited source states active exploitation.
Researcher notes
Evidence supports a SIP inspection parsing flaw leading to CWE-191 integer underflow and crash. The bundle lacks exact version ranges, fixed releases, workaround details, and exploitation telemetry, so remediation should be anchored to Cisco’s advisory.
Mitigation direction
- Review the Cisco advisory for affected releases and fixed software guidance.
- Prioritize remediation for perimeter, voice, and high-availability firewall deployments.
- Assess whether SIP inspection is required in exposed traffic paths.
- Monitor Cisco security guidance for product-specific mitigations or upgrades.
Validation and detection
- Inventory Cisco ASA and FTD devices and software versions.
- Identify devices that inspect or pass SIP traffic.
- Compare deployed versions and configuration against Cisco’s advisory.
- Review logs and availability events for unexplained crashes involving SIP traffic.
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.
CWE-191: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-12678 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
- High
- CVSS
- 8.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.6HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20191002 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SIP Inspection Denial of Service VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
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.
Integer Underflow (Wrap or Wraparound)
Integer Underflow (Wrap or Wraparound) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.