CVE-2024-43573
CVE-2024-43573 is a security flaw in Microsoft Windows, Microsoft’s operating system for PCs and servers. Attackers can make something fake look genuine in Microsoft Windows. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 8 Oct 2024.[1]
Microsoft Windows is in things households have, such as phones, computers, browsers and everyday apps, so the fix matters at home as much as at work. Fixed in version 10.0.10240.20796, 10.0.14393.7428, 10.0.17763.6414 and 10.0.19044.5011 and others.
Description
CISA calls it an MSHTML platform spoofing in Microsoft Windows. In its words: “Microsoft Windows MSHTML Platform contains an unspecified spoofing vulnerability which can lead to a loss of confidentiality.”[1]
The underlying weakness is cross-site scripting (CWE-79), in MITRE’s list of common software weaknesses.[2]
It scores 8.1 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record lists these fixed versions: in each line, everything before the version shown is affected.[2]
| Product | Fixed in |
|---|---|
| Windows 10 Version 1507 | 10.0.10240.20796 |
| Windows 10 Version 1607 | 10.0.14393.7428 |
| Windows 10 Version 1809 | 10.0.17763.6414 |
| Windows 10 Version 21H2 | 10.0.19044.5011 |
| Windows 10 Version 22H2 | 10.0.19045.5011 |
| Windows 11 version 21H2 | 10.0.22000.3260 |
| Windows 11 version 22H2 | 10.0.22621.4317 |
| Windows 11 version 22H3 | 10.0.22631.4317 |
Every device with Microsoft Windows needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 8 Oct 2024, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 29 Oct 2024 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 46%. That’s in the top 2% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Microsoft has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.”[1]
- Update Microsoft Windows now.On Windows: Settings, Windows Update, Check for updates, then restart. Office updates come the same way, or from any Office app: File, Account, Update Options. Then turn on automatic updates, so the next fix arrives on its own.
- Check you’re on 10.0.10240.20796 or later.Fixed in version 10.0.10240.20796, 10.0.14393.7428, 10.0.17763.6414 and 10.0.19044.5011 and others. Anything older is what attackers are going after.
- If there’s no update, stop using it.CISA’s advice when a flaw being used in attacks has no fix is to stop using the product until it does.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.1.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 46%.[4] |
See also
Other Microsoft Windows flaws
- CVE-2026-96951: command injection ·
- CVE-2026-85880: heap-based buffer overflow ·
- CVE-2026-81963: link following ·
- CVE-2008-4250: buffer overflow ·
- CVE-2026-32202: protection mechanism failure ·
- CVE-2025-60710: link following ·
Other cross-site scripting flaws
- CVE-2025-48700, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
- CVE-2025-66376, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
- CVE-2025-68461, Roundcube Webmail: cross-site scripting ·
- CVE-2021-26829, OpenPLC ScadaBR: cross-site scripting ·
- CVE-2025-27915, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
Added the same day
- CVE-2024-43572, Microsoft Windows: management console remote code execution ·
- CVE-2024-43047, Qualcomm Multiple Chipsets: use-after-free ·
Every Microsoft flaw on CISA’s list · Everything added in October 2024
References
- ^ Cybersecurity and Infrastructure Security Agency. “Microsoft Windows MSHTML Platform Spoofing Vulnerability”. Known Exploited Vulnerabilities Catalog, added 8 Oct 2024.
- ^ National Institute of Standards and Technology. “CVE-2024-43573 Detail”. National Vulnerability Database, published 8 Oct 2024.
- ^ Microsoft. Advisories and fixes: msrc.microsoft.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.461, percentile 98.8, 31 Oct 2026.
- CVE Program. “CVE-2024-43573”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.