Known exploited vulnerability
CVE-2018-0802
The short answer
CVE-2018-0802 affects Microsoft Corporation Equation Editor and is rated high (CVSS 7.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
Equation Editor in Microsoft Office 2007, Microsoft Office 2010, Microsoft Office 2013, and Microsoft Office 2016 allow a remote code execution vulnerability due to the way objects are handled in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE is unique from CVE-2018-0797 and CVE-2018-0812.
Weakness: CWE-787.
Severity
7.8 high
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Nov 3, 2021
Federal due date May 3, 2022
EPSS, next 30 days
93%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
Equation Editor. NVD's record lists the exact affected versions.
References
- 0patch.blogspot.com/2018/01/the-bug-that-killed-equation-editor-how.html ExploitThird Party Advisory
- github.com/rxwx/CVE-2018-0802 ExploitThird Party Advisory
- github.com/zldww2011/CVE-2018-0802_POC Third Party Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0802 PatchVendor Advisory
- research.checkpoint.com/another-office-equation-rce-vulnerability/ Exploit
- 0patch.blogspot.com/2018/01/the-bug-that-killed-equation-editor-how.html ExploitThird Party Advisory
- github.com/rxwx/CVE-2018-0802 ExploitThird Party Advisory
- github.com/zldww2011/CVE-2018-0802_POC Third Party Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0802 PatchVendor Advisory
- research.checkpoint.com/another-office-equation-rce-vulnerability/ Exploit
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0802 US Government Resource
Questions
Is CVE-2018-0802 being exploited?
Yes. CISA added CVE-2018-0802 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03. CISA lists it as used in ransomware campaigns.
How do I fix CVE-2018-0802?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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