CVE-2007-0671 — Microsoft Office Excel Remote Code Execution Vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

CISA required action CISA

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

US federal deadline: Sep 2, 2025 — passed 408 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Microsoft Access, Microsoft Excel, Microsoft Excel Viewer…).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
4. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
5. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
6. EPSS ahead of 99% of scored CVEs: prioritize it in the patch queue.
7. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

EPSS over time FIRST

Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 43.24%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Hunt retroactively in logs from before Aug 12, 2025 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• Affected products added · microsoft/access, microsoft/excel, microsoft/excel viewer, microsoft/frontpage, microsoft/infopath, microsoft/office, mi
  Oct 13, 2026 · NIST National Vulnerability Database
• CVSS changed · 8.8
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Added to CISA KEV (detected)
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Record created in this database
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• 2025
• Added to CISA KEV catalog
  Aug 11, 2025 · CISA
• 2007
• CVE published
  Feb 2, 2007 · microsoft

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

17 on the record

• www.vupen.com/english/advisories/2007/0463
  Vendor Advisory, vdb-entry, x_refsource_VUPEN, NIST National Vulnerability Database
• learn.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015
  Vendor Advisory, NIST National Vulnerability Database
• www.microsoft.com/technet/security/advisory/932553.mspx
  Broken Link, Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-015
  Vendor Advisory, vendor-advisory, x_refsource_MS, NIST National Vulnerability Database
• secunia.com/advisories/24008
  Broken Link, Vendor Advisory, third-party-advisory, x_refsource_SECUNIA, NIST National Vulnerability Database
• www.kb.cert.org/vuls/id/613740
  US Government Resource, third-party-advisory, x_refsource_CERT-VN, NIST National Vulnerability Database
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  US Government Resource, NIST National Vulnerability Database
• www.us-cert.gov/cas/techalerts/TA07-044A.html
  Broken Link, US Government Resource, third-party-advisory, x_refsource_CERT, NIST National Vulnerability Database
• vil.nai.com/vil/content/v_141393.htm
  Broken Link, x_refsource_MISC, NIST National Vulnerability Database
• github.com/advisories/GHSA-h24h-phxr-rg3x
  GitHub Security Advisories
• nvd.nist.gov/vuln/detail/CVE-2007-0671
  GitHub Security Advisories
• osvdb.org/31901
  Broken Link, vdb-entry, x_refsource_OSVDB, NIST National Vulnerability Database
• oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A301
  Broken Link, vdb-entry, signature, x_refsource_OVAL, NIST National Vulnerability Database
• securitytracker.com/id
  Broken Link, vdb-entry, x_refsource_SECTRACK, NIST National Vulnerability Database
• www.securityfocus.com/bid/22383
  Broken Link, vdb-entry, x_refsource_BID, NIST National Vulnerability Database
• exchange.xforce.ibmcloud.com/vulnerabilities/32178
  Third Party Advisory, vdb-entry, x_refsource_XF, NIST National Vulnerability Database
• www.avertlabs.com/research/blog/
  Broken Link, x_refsource_MISC, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-70327 Out-of-bounds Read in Microsoft 365 Apps Aug 11, 2026
• Medium CVE-2026-70328 Out-of-bounds Read in Microsoft 365 Apps Aug 11, 2026
• High CVE-2026-70329 Integer Overflow or Wraparound in Microsoft 365 Apps Aug 11, 2026
• Medium CVE-2026-70318 Improper Input Validation in Microsoft 365 Apps Aug 11, 2026
• Medium CVE-2026-70310 Out-of-bounds Read in Microsoft 365 Apps Aug 11, 2026
• High CVE-2026-70311 Use After Free in Microsoft 365 Apps Aug 11, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No CWE classification.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2007-0671 is "Microsoft Office Excel Remote Code Execution Vulnerability", rated High. It affects Access (Microsoft); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.8 describes technical severity. EPSS 43.24% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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