CVE-2017-12319 Cisco IOS XE Software: software flaw

In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.

Confirmed exploited by CISA on Mar 3, 2022 · US federal patch deadline Mar 24, 2022

What to do

Install Cisco's security update for IOS XE Software. If no update exists, follow the vendor's workaround or stop using the product until one ships.
Install system updates the day they come out — most phone zero-days are fixed in a point release.
Restart your phone every few days; some spyware does not survive a reboot.
If you are a journalist, activist, lawyer, politician or executive, turn on Lockdown Mode (iPhone) or Advanced Protection (Android).

Who is affected

Could reach you. This one is aimed at devices or apps of the kind people own.

What's at risk: Messages, photos, location, microphone and camera. The most serious ones are "zero-click": no tap needed from the owner. They are usually used as spyware against a small number of chosen people.

The details

Official name: Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability
Product: Cisco IOS XE Software
CISA description: A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability.
Type of flaw: Software flaw (CWE-20)
Confirmed exploited: Mar 3, 2022
US federal patch deadline: Mar 24, 2022

NVD record ↗CISA catalog ↗

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Answering about CVE-2017-12319 ·

Questions about CVE-2017-12319

Is CVE-2017-12319 being exploited?

Yes. CISA added CVE-2017-12319 to its Known Exploited Vulnerabilities catalog on Mar 3, 2022, which means there is reliable evidence of real-world attacks.

How do I fix CVE-2017-12319?

Install Cisco's security update for IOS XE Software. If no update exists, follow the vendor's workaround or stop using the product until one ships. Install system updates the day they come out — most phone zero-days are fixed in a point release.

Am I affected by CVE-2017-12319?

Only if you use Cisco IOS XE Software. This one is aimed at devices or apps of the kind people own.