CVE-1999-1577 json
Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrar…
published 1999-10-31 27 y ago modified 2026-06-16 4 mo ago also EUVD-1999-1558
- cvss
- 5.1
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 19.5%
- EPSS 19.5% chance of exploitation in 30 days, percentile 97%
- public exploits
- 1
- Exploit-DB
Summary
Buffer overflow in HHOpen ActiveX control (hhopen.ocx) 1.0.0.1 for Internet Explorer 4.01 and 5 allows remote attackers to execute arbitrary commands via long arguments to the OpenHelp method.
Timeline
- First public exploit (EDB-19521)
- Published
Exploit prediction
19.49% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-19521 Microsoft Internet Explorer 5.0/4.0.1 - hhopen OLE Control Buffer Overflow remote, 1999-09-27
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.1 | AV:N/AC:H/Au:N/C:P/I:P/A:P |
References
-
exchange.xforce.ibmcloud.com
/vulnerabilities/3314
vdb-entry
-
kb.cert.org
/vuls/id/29795
third-party-advisory, us-government-resource
-
securityfocus.com
/bid/669
vdb-entry
-
securityfocus.com
/archive/1/28719
mailing-list
Sources
- CVE List CVE-1999-1577
- NVD CVE-1999-1577
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.