Threats / Microsoft / CVE-2013-1331
CVE-2013-1331
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Office vulnerability
Microsoft Office contains a buffer overflow vulnerability in PNG data handling that allows remote code execution when processing crafted Office documents.
Verdict
Today item — known-exploited.
A buffer overflow in Office's PNG processing enables unauthenticated remote code execution through malicious document delivery. The vulnerability has been exploited in the wild and carries high exploitation likelihood.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-06-08).
Probability (EPSS)
EPSS 0.81877 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Office. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-119 Memory Buffer Bounds Error — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious Office document containing specially formatted PNG data designed to overflow a buffer.
Business
An employee receives and opens the document, triggering code execution with their privileges.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I distribute the weaponized document via email or file-sharing to target organizations.
Business
Initial compromise establishes a foothold for lateral movement and data exfiltration across the network.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute arbitrary code with the privileges of the Office application and the user running it.
Business
Attackers gain capability to steal intellectual property, install persistent malware, or pivot to critical systems.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05