Security readout for executives and security teams
Plain-English summary
This flaw lets a person who already has administrator access to an affected Cisco ASR 9000 router escalate from IOS XR CLI control to root control of the underlying Linux system. The entry barrier is high, but successful abuse could mean complete compromise of a critical routing device.
Executive priority
Handle as a priority maintenance and privileged-access risk for critical routing infrastructure. It is not flagged as actively exploited in the provided sources, but root-level compromise of a core router would carry serious operational and security impact.
Technical view
CVE-2019-12709 is a CWE-78 command injection issue in a Cisco IOS XR VMAN CLI command on ASR 9000 devices. Insufficient argument validation can let an authenticated local attacker with valid administrator access execute arbitrary Linux commands as root. CVSS v3.0 is 6.7 with local access and high privileges required.
Likely exposure
Exposure appears limited to Cisco ASR 9000 Series Aggregation Services Routers running affected Cisco IOS XR Software. The bundle does not identify exact affected or fixed versions, so version confirmation must come from Cisco’s advisory and device inventory.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires valid administrator access to the affected device and malicious input to a specific VMAN CLI command, making insider misuse or compromised admin credentials the main concern.
Researcher notes
The key constraint is PR:H and AV:L: this is post-authentication privilege escalation, not remote unauthenticated entry. The provided data lacks fixed-version detail and exploit telemetry. Validation should focus on asset/version mapping, admin access exposure, and evidence of suspicious privileged CLI activity.
Mitigation direction
- Identify ASR 9000 routers running Cisco IOS XR Software.
- Review Cisco’s advisory for affected and fixed release guidance.
- Apply Cisco-recommended fixed software where devices are affected.
- Restrict administrator access to trusted operators and management networks.
- Audit privileged accounts and remove unnecessary admin access.
- Monitor router administrative activity for unusual VMAN CLI use.
Validation and detection
- Compare deployed IOS XR versions against Cisco’s advisory.
- Confirm affected devices are ASR 9000 Series routers.
- Verify only authorized users have administrator access.
- Review administrative logs for suspicious VMAN-related command activity.
- Confirm remediation status after applying vendor guidance.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-12709 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
- 6.7 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/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:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H0.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.7MediumVector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20190925 Cisco IOS XR Software for Cisco ASR 9000 VMAN CLI Privilege Escalation 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 Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.