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CVE-1999-1539

33
FAUCET Score

CVE-1999-1539 describes a buffer overflow vulnerability in the FTP server component of QPC Software's QVT/Term Plus versions 4.2d and 4.3, and QVT/Net 4.3. This flaw allows unauthenticated remote attackers to trigger a denial of service and potentially execute arbitrary commands by supplying an excessively long username or password. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low attack complexity, leading to potential compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or Metasploit modules, a Denial of Service exploit is available on ExploitDB, though the vulnerability receives minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
4.3CPE matchmatch criteria
cpe:2.3:a:qpc_software:qvt_net:4.3:*:*:*:*:*:*:*
4.2dCPE matchmatch criteria
cpe:2.3:a:qpc_software:qvt_term_plus:4.2d:*:*:*:*:*:*:*
4.3CPE matchmatch criteria
cpe:2.3:a:qpc_software:qvt_term_plus:4.3:*:*:*:*:*:*:*

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
11.86%
Probability of exploitation in next 30 days
EPSS Percentile
95.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-19619 · Nov 10, 1999
This CVE's current EPSS score of 0.1186 is in the 93rd percentile among its peer group of 51,485 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

marc.info
marc.info
exchange.xforce.ibmcloud.com / vulnerabilities/3491
securityfocus.com / bid/796
ExploitVendor Advisory