CVE-2015-2423 — Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8,...

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.

• Documented patch — docs.microsoft.com (NIST National Vulnerability Database)
• Documented patch — docs.microsoft.com (NIST National Vulnerability Database)
• Documented patch — docs.microsoft.com (NIST National Vulnerability Database)

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 Excel, Microsoft Internet Explorer, Microsoft Office…).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. Apply the fixed version or the patch documented under Remediation.
4. EPSS ahead of 97% of scored CVEs: prioritize it in the patch queue.
5. Search available logs for exploit probes matching the vulnerability class (info disclosure), 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.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-200 · Exposure of Sensitive Information

Other CVEs with this weakness →

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).
• Look for anomalous data read/export volumes and access to sensitive records.

Timeline

What happened to this CVE, newest first.

• 2026
• SSVC assessment updated
  Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 14, 2026
• Fix documented
  Oct 14, 2026 · NIST National Vulnerability Database
• Affected products added · microsoft/excel, microsoft/office, microsoft/powerpoint, microsoft/visio, microsoft/word, microsoft/internet explorer, m
  Oct 14, 2026 · NIST National Vulnerability Database
• CVSS changed · 4.3
  Oct 14, 2026 · NIST National Vulnerability Database
• Source status changed · → Modified
  Oct 14, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 14, 2026 · Alertas do Telegram
• 2015
• CVE published
  Aug 14, 2015 · microsoft

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 14, 2026 – Oct 14, 2026
• 1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

8 on the record

• docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-081
  Patch, Vendor Advisory, vendor-advisory, x_refsource_MS, NIST National Vulnerability Database
• docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-079
  Patch, Vendor Advisory, vendor-advisory, x_refsource_MS, NIST National Vulnerability Database
• docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-088
  Patch, Vendor Advisory, vendor-advisory, x_refsource_MS, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2015-2423
  GitHub Security Advisories
• www.securitytracker.com/id/1033239
  Third Party Advisory, VDB Entry, vdb-entry, x_refsource_SECTRACK, NIST National Vulnerability Database
• www.securitytracker.com/id/1033237
  Third Party Advisory, VDB Entry, vdb-entry, x_refsource_SECTRACK, NIST National Vulnerability Database
• www.securitytracker.com/id/1033248
  Third Party Advisory, VDB Entry, vdb-entry, x_refsource_SECTRACK, NIST National Vulnerability Database
• github.com/advisories/GHSA-w76h-498m-3wj9
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-97844 Role: DNS Server Information Disclosure Vulnerability 2d
• Medium CVE-2026-97843 Role: DNS Server Information Disclosure Vulnerability 2d
• Medium CVE-2026-97839 Role: DNS Server Information Disclosure Vulnerability 2d
• Medium CVE-2026-97840 Role: DNS Server Information Disclosure Vulnerability 2d
• Medium CVE-2026-97842 Role: DNS Server Information Disclosure Vulnerability 2d
• Medium CVE-2026-97841 Role: DNS Server Information Disclosure Vulnerability 2d

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 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-2015-2423 is "Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8,...", rated Medium. It affects Excel (Microsoft); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.3 describes technical severity. EPSS 19.85% 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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