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CVE-1999-0440

20
FAUCET Score

CVE-1999-0440 describes a critical vulnerability in the Java Virtual Machine's byte code verifier, affecting Netscape and Sun Java products, which permits remote code execution via malicious web pages. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with low complexity, potentially leading to full compromise of confidentiality, integrity, and availability. Despite its age and severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
4.5CPE matchmatch criteria
cpe:2.3:a:netscape:communicator:4.5:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:netscape:navigator:4.0:*:*:*:*:*:*:*
4.01CPE matchmatch criteria
cpe:2.3:a:netscape:navigator:4.01:*:*:*:*:*:*:*
4.02CPE matchmatch criteria
cpe:2.3:a:netscape:navigator:4.02:*:*:*:*:*:*:*
4.03CPE matchmatch criteria
cpe:2.3:a:netscape:navigator:4.03:*:*:*:*:*:*:*

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
3.64%
Probability of exploitation in next 30 days
EPSS Percentile
88.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0364 is in the 79th 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

java.sun.com / pr/1999/03/pr990329-01.html
marc.info
securityfocus.com / bid/1939