Exploited vulnerability · CISA KEV

Is CVE-2017-6744 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Cisco IOS software · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-6744, Cisco IOS Software SNMP Remote Code Execution Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 1690 days after it was published. It affects Cisco IOS software. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Mar 2022

ransomwareNot knownno confirmed use

EPSStop 10%more likely than most to be exploited

severity8.8CVSS 3.0 · high

US federal due24 Mar 2022BOD 22-01 deadline

What it is

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS 1 contains a vulnerability that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6.

Vendor	Cisco (103 exploited CVEs in KEV)
Product	IOS software
Vulnerability	Cisco IOS Software SNMP Remote Code Execution Vulnerability
Weakness	CWE-119
Published	17 Jul 2017
Added to KEV	3 Mar 2022
Reported by (CNA)	cisco

What to do

Check whether you run it. Look for IOS software in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
Apply the fix. Apply updates per vendor instructions.
If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 17 Jul 2017.
Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS software

CVE-2018-0180: Cisco IOS Software Denial-of-Service Vulnerability (3 Mar 2022)
CVE-2018-0179: Cisco IOS Software Denial-of-Service Vulnerability (3 Mar 2022)
CVE-2018-0161: Cisco IOS Software Resource Management Errors Vulnerability (3 Mar 2022)
CVE-2018-0154: Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Vulnerability (3 Mar 2022)
CVE-2017-12235: Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Vulnerability (3 Mar 2022)
CVE-2017-12234: Cisco IOS Software Common Industrial Protocol Request Denial-of-Service Vulnerability (3 Mar 2022)

References

nvd.nist.gov/vuln/detail/CVE-2017-6744

Questions

Is CVE-2017-6744 being exploited?

Yes. CISA added CVE-2017-6744 to the Known Exploited Vulnerabilities catalog on 3 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-6744 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2017-6744?

Apply updates per vendor instructions. Check Cisco's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected IOS software and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2022 · Cisco scorecard · act-now radar.

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