CVE-2017-6770

What it is

Cisco IOS 12.0 through 15.6, Adaptive Security Appliance (ASA) Software 7.0.1 through 9.7.1.2, NX-OS 4.0 through 12.0, and IOS XE 3.6 through 3.18 are affected by a vulnerability involving the Open Shortest Path First (OSPF) Routing Protocol Link State Advertisement (LSA) database. This vulnerability could allow an unauthenticated, remote attacker to take full control of the OSPF Autonomous System (AS) domain routing table, allowing the attacker to intercept or black-hole traffic. The attacker could exploit this vulnerability by injecting crafted OSPF packets. Successful exploitation could cause the targeted router to flush its routing table and propagate the crafted OSPF LSA type 1 update throughout the OSPF AS domain. To exploit this vulnerability, an attacker must accurately determine certain parameters within the LSA database on the target router. This vulnerability can only be triggered by sending crafted unicast or multicast OSPF LSA type 1 packets. No other LSA type packets can trigger this vulnerability. OSPFv3 is not affected by this vulnerability. Fabric Shortest Path First (FSPF) protocol is not affected by this vulnerability. Cisco Bug IDs: CSCva74756, CSCve47393, CSCve47401.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-08-07 06:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:23 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 4.2 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-08-07 06:29 UTC

Last modified

2026-06-17 01:23 UTC

Exploit probability

1.7% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco nx-os 1.1\(0.825a\)
• Cisco nx-os 1.1\(1g\)
• Cisco nx-os For Nexus 5500 Platform Switches 7.3\(1\)n1\(1\)
• Cisco nx-os For Nexus 5500 Platform Switches Base
• Cisco nx-os For Nexus 5600 Platform Switches 7.3\(1\)n1\(1\)
• Cisco nx-os For Nexus 5600 Platform Switches Base
• Cisco nx-os For Nexus 7700 Series Switches 8.0\(1\)\(ed\)
• Cisco nx-os For Nexus 7700 Series Switches 8.1\(1\)\(ed\)

Attack profile CVSS 3.1 · 4.2

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2017-6770.md and follow it. Check whether this project is affected by CVE-2017-6770. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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