Microsoft Edge and Internet Explorer Memory Corruption Vulnerability
Microsoft Edge and Internet Explorer contain a memory corruption vulnerability that allows attackers to execute code in the context of the current user.
- Vendor
- Microsoft
- Product
- Edge and Internet Explorer
- CVSS
- 4.2
- EPSS (exploit probability)
- 2.7%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-0878 being exploited?
Yes. CISA added CVE-2020-0878 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 2.7% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2020-0878 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (181 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Microsoft Internet Explorer and Edge CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2016-3351 Microsoft Internet Explorer and Edge Information Disclosure Vulnerabilityransomware use | [ MEDIUM ] | 6.5 | 26.5% | |
| CVE-2017-0037 Microsoft Edge and Internet Explorer Type Confusion Vulnerability | [ HIGH ] | 8.1 | 80.4% |