Security readout for executives and security teams
CVE-2009-0557 is an old Microsoft Excel remote code execution flaw. A victim must open a specially crafted Excel file, which can let an attacker run code. CISA lists it in the Known Exploited Vulnerabilities catalog, so legacy Office installations should be treated as urgent exposure. Exposure is most likely on legacy workstations, terminal servers, or file-processing systems still running the affected Office, Excel Viewer, converter, or Compatibility Pack versions. Risk depends on users or automated workflows opening untrusted Excel files. Prioritize remediation where legacy Office remains in use, especially on systems receiving external documents. KEV status raises urgency, but exploitation still depends on crafted files being opened or processed. Mitigation focus: Apply Microsoft guidance and updates from MS09-021.; Remove or isolate unsupported affected Office versions where patching is not possible.; Disable legacy Excel file handling on systems that do not require it..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-94: Code execution behavior lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2009-0557 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- oval:org.mitre.oval:def:5564CVE reference · vdb-entry, signature
- MS09-021CVE reference · vendor-advisory, x_refsource_MS
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-0557CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.