Security readout for executives and security teams
Plain-English summary
This flaw can make affected Cisco SIP phones reboot and fail to register, disrupting voice availability. It does not expose data or allow takeover in the provided sources, but it can affect business communications where vulnerable phones are deployed.
Executive priority
Treat this as a moderate availability risk for voice services. It is not described as data theft or remote control, but vulnerable phones may become unavailable, affecting support desks, operations teams, and sites dependent on Cisco handsets.
Technical view
Cisco describes insufficient validation of SIP packets in Cisco IP Phone 7800 and 8800 Series SIP software. Altered SIP replies during registration can trigger a reboot and prevent registration. CVSS v3.0 is 5.3 with network attack vector, high complexity, no privileges, user interaction required, and availability impact only.
Likely exposure
Exposure is most likely in organizations running Cisco IP Phone 7800 or 8800 Series with SIP software. The bundle gives no specific vulnerable version range; the structured affected list names Cisco IP Phone 8800 Series Software with unspecified versions.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The described attack depends on altering SIP replies sent to a phone during registration, which suggests exposure is tied to SIP signaling control or manipulation opportunities.
Researcher notes
The evidence is limited to Cisco and CVE metadata. The affected version range and fix details are not present in the bundle. Avoid assuming exploitation in the wild; use Cisco’s advisory to resolve version-specific exposure and remediation.
Mitigation direction
- Review Cisco’s advisory for affected releases, fixed software, and supported remediation.
- Inventory Cisco 7800 and 8800 Series phones running SIP software.
- Prioritize remediation for phones supporting critical business or emergency communications.
- Limit SIP signaling exposure to trusted voice infrastructure where feasible.
- Monitor vendor guidance because no standalone workaround is provided in the bundle.
Validation and detection
- Confirm whether Cisco 7800 or 8800 Series SIP phones are deployed.
- Compare deployed phone software against Cisco advisory guidance.
- Check voice operations for repeated phone reboots or registration failures.
- Review network design for SIP signaling paths reaching affected phones.
- Document whether affected phones support critical users, sites, or call flows.
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
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CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-1922 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
- Medium
- CVSS
- 5.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/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:H/PR:N/UI:R/S:U/C:N/I:N/A:H1.63.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.3MediumVector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20190703 Cisco IP Phone 7800 and 8800 Series Session Initiation Protocol 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.