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Exploited vulnerability · CISA KEV

Is CVE-2019-18988 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · TeamViewer Desktop · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-18988, TeamViewer Desktop Bypass Remote Login Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 635 days after it was published. It affects TeamViewer Desktop. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 10%more likely than most to be exploited
severity7CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

TeamViewer Desktop allows for bypass of remote-login access control because the same AES key is used for different customers' installations. If an attacker were to know this key, they could decrypt protected information stored in registry or configuration files or decryption of the Unattended Access password to the system (which allows for remote login to the system).

VendorTeamViewer (1 exploited CVE in KEV)
ProductDesktop
VulnerabilityTeamViewer Desktop Bypass Remote Login Vulnerability
WeaknessCWE-521
Published7 Feb 2020
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Desktop in your asset inventory, including appliances and cloud images. Stack check lists every exploited TeamViewer CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. 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 7 Feb 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for TeamViewer.

References

Questions

Is CVE-2019-18988 being exploited?

Yes. CISA added CVE-2019-18988 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-18988 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-2019-18988?

Apply updates per vendor instructions. Check TeamViewer's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Desktop 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 November 2021 · act-now radar.

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