Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker bypass authentication on Cisco IOS XE devices where the optional REST API virtual service container is installed and activated. Successful abuse can obtain an authenticated user's token-id and use the REST API interface for privileged actions. Exposure is narrower because the REST API interface is not enabled by default.
Executive priority
Treat as urgent for any IOS XE environment using the optional REST API container, especially if management access is externally reachable. The business risk is device takeover through privileged API actions, but scope depends on whether the optional REST API service is actually enabled.
Technical view
CVE-2019-12643 is an authentication bypass in the Cisco IOS XE REST API virtual service container caused by an improper authentication check. A remote attacker can send crafted HTTP requests to obtain a valid token-id, then bypass authentication and perform privileged REST API actions. The CVSS 3.0 score is 10.0 and the weakness maps to CWE-287.
Likely exposure
Likely exposed systems are Cisco IOS XE devices where the REST API virtual service container was separately installed and activated. Internet-reachable or broadly reachable management interfaces would raise urgency. The provided bundle does not specify exact affected versions, so inventory and Cisco advisory review are required.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. However, the vulnerability is remotely reachable, unauthenticated, low complexity, and requires no user interaction, with potential high confidentiality, integrity, and availability impact on affected devices.
Researcher notes
Evidence is strongest for vulnerability mechanics, severity, and exposure condition. The bundle lacks exact affected version ranges, patch release details, and exploitation telemetry. Avoid assuming broad IOS XE exposure; first prove REST API container installation, activation, and network reachability.
Mitigation direction
- Identify IOS XE devices with the REST API virtual service container installed and active.
- Check Cisco's advisory for affected releases, fixed software, and supported mitigation guidance.
- Disable or remove the REST API virtual service where it is not business-required.
- Restrict management-plane access to trusted administrative networks only.
- Prioritize remediation for internet-facing or shared-network management interfaces.
Validation and detection
- Confirm whether each IOS XE device has the REST API interface installed and activated.
- Review device exposure paths for REST API reachability from untrusted networks.
- Verify current IOS XE release status against Cisco's advisory.
- Check logs for suspicious REST API authentication or token activity.
- Document devices where the REST API is disabled or not installed.
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-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-12643 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
- Critical
- CVSS
- 10 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/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:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
10CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20190828 Cisco REST API Container for IOS XE Software Authentication Bypass 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.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.