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Evidence dossier
CVE-2020-0878
Microsoft Browser Memory Corruption Vulnerability
gen-56ccdaf9Normalized restatement
<p>A remote code execution vulnerability exists in the way that Microsoft browsers access objects in memory. The vulnerability could corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, the attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p> <p>An attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers, and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically via an enticement in email or instant message, or by getting them to open an email attachment.</p> <p>The security update addresses the vulnerability by modifying how Microsoft browsers handle objects in memory.</p>
- State
- PUBLISHED
- Published
- Sep 11, 2020
- Updated
- Oct 21, 2025
- Evidence coverage
- 72%
2026-07-18 · v2026.06.15 · percentile 84.2%
Distinct CVSS assessments remain side by side; none are averaged.
Source comparison
Who said what
Microsoft Browser Memory Corruption Vulnerability
Microsoft Edge and Internet Explorer Memory Corruption Vulnerability
Probability 0.026960000000; percentile 0.842360000000
Applicability
Cited product scope
[{"status": "affected", "version": "0", "lessThan": "publication", "versionType": "custom"}]unknown[{"status": "affected", "version": "1.0.0", "lessThan": "publication", "versionType": "custom"}]unknown[{"status": "affected", "version": "1.0.0", "lessThan": "publication", "versionType": "custom"}]unknown[{"status": "affected", "version": "1.0..0", "lessThan": "publication", "versionType": "custom"}]unknowncpe:2.3:a:microsoft:chakracore:-:*:*:*:*:*:*:*supportedcpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*supportedcpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*supportedcpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*supportedcpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*constrainedcpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*constrainedcpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*constrainedAssessments
CVSS by origin
AV:N/AC:H/Au:N/C:P/I:P/A:PCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:NCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:CLimitations and unknowns
- KEV membership is authoritative for the catalog, not proof of exposure in any environment.
- EPSS is a dated model probability and not an individual-environment prediction.
- Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
- NVD-carried upstream facts remain derivative and are not independent corroboration.
- Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
- NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
- Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
- Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.