CVE-1999-0725Internet Information Server Vulnerability
When IIS is run with a default language of Chinese, Korean, or Japanese, it allows a remote attacker to view the source code of certain files, a.k.a.
Published Aug 19, 1999 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-1999-0725 is a high-severity vulnerability (CVSS 7.1 v2) affecting Internet Information Server (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 25% 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
7.1
AV:N/AC:M/Au:N/C:C/I:N/A:N
EPSS (30-day exploit likelihood)
25%
Higher than 97.8% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
36/100
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
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryiis-double-byte-code-page(2302)
- advisory477
Description
When IIS is run with a default language of Chinese, Korean, or Japanese, it allows a remote attacker to view the source code of certain files, a.k.a. "Double Byte Code Page".
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Internet Information ServerMicrosoft | 3.0, 4.0 | n/a |
Timeline
Publicly disclosed
Aug 19, 1999
Last updated
Apr 15, 2026
Weakness Type
- CWE-16
References
- advisoryiis-double-byte-code-page(2302)
- advisory477
- exploitExploitDB-19361
- otherMS99-022
- otherQ233335
FAQ
Common Questions.
When IIS is run with a default language of Chinese, Korean, or Japanese, it allows a remote attacker to view the source code of certain files, a.k.a.
Affected: Internet Information Server (Microsoft) versions 3.0, 4.0. 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-1999-0725 On Your Attack Surface?
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