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CVE-1999-1189

20
FAUCET Score

CVE-1999-1189 describes a buffer overflow vulnerability in Netscape Navigator/Communicator 4.7 for Windows 95 and 98. This flaw allows remote attackers to trigger a denial of service, and potentially execute arbitrary commands, by supplying an overly long argument in a URL referencing specific file types. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to partial confidentiality, integrity, and availability compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this legacy vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.7CPE matchmatch criteria
cpe:2.3:a:netscape:communicator:4.7:*:*:*:*:*:*:*
4.7CPE matchmatch criteria
cpe:2.3:a:netscape:navigator:4.7:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.52%
Probability of exploitation in next 30 days
EPSS Percentile
83.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0252 is in the 70th percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

exchange.xforce.ibmcloud.com / vulnerabilities/7884
securityfocus.com / archive/1/36306
ExploitVendor Advisory
securityfocus.com / archive/1/36608
Vendor Advisory
securityfocus.com / bid/822
ExploitPatchVendor Advisory