CVE-2007-0427Html Help Workshop Vulnerability
Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted remote attackers to execute arbitrary code via a help project (.HPJ) file with a long HLP field in the OPTIONS section.
Published Jan 22, 2007 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2007-0427 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Html Help Workshop (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 31% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
31%
Higher than 98.2% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
41/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Description
Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted remote attackers to execute arbitrary code via a help project (.HPJ) file with a long HLP field in the OPTIONS section.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Html Help WorkshopMicrosoft | 4.03.0002 | n/a |
Timeline
Publicly disclosed
Jan 22, 2007
Last updated
Apr 22, 2026
References
- exploitExploitDB-3149
- exploitExploitDB-3159
- exploitanspi.pl · hpj-x01.cpp
- exploit22135
- other31899
FAQ
Common Questions.
Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted remote attackers to execute arbitrary code via a help project (.HPJ) file with a long HLP field in the OPTIONS section.
Affected: Html Help Workshop (Microsoft) versions 4.03.0002. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2007-0427 On Your Attack Surface?
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