Exploited vulnerability · CISA KEV

Is CVE-2020-0878 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Microsoft Edge and Internet Explorer · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-0878, Microsoft Edge and Internet Explorer Memory Corruption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 418 days after it was published. It is known to be used in ransomware campaigns. It affects Microsoft Edge and Internet Explorer. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

Microsoft Edge and Internet Explorer contain a memory corruption vulnerability that allows attackers to execute code in the context of the current user.

What to do

1. Check whether you run it. Look for Edge and Internet Explorer in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft 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 11 Sep 2020.
4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Edge and Internet Explorer

• CVE-2017-0037: Microsoft Edge and Internet Explorer Type Confusion Vulnerability (28 Mar 2022)

References

• nvd.nist.gov/vuln/detail/CVE-2020-0878

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 · Microsoft scorecard · act-now radar.