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Vulnerability record · CVE-2002-1511 · published 3 March 2003

CVE-2002-1511: Att vnc vulnerability

Att · Vnc

The vncserver wrapper for vnc before 3.3.3r2-21 uses the rand() function instead of srand(), which causes vncserver to generate weak cookies.

5.0 CVSS 2.0 Medium EPSS 1.8% · top 22.3%
5.0CVSS 2.0 base score
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
18References
16 Jun 2026Last modified by NVD

Description

The vncserver wrapper for vnc before 3.3.3r2-21 uses the rand() function instead of srand(), which causes vncserver to generate weak cookies.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://changelogs.credativ.org/debian/pool/main/v/vnc/vnc_3.3.6-3/changelog
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000640
http://security.gentoo.org/glsa/glsa-200302-15.xml
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert/56161
http://www.iss.net/security_center/static/11384.php Vendor Advisory
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:022
http://www.redhat.com/support/errata/RHSA-2003-041.html PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-068.html
http://www.securityfocus.com/bid/6905
http://changelogs.credativ.org/debian/pool/main/v/vnc/vnc_3.3.6-3/changelog
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000640
http://security.gentoo.org/glsa/glsa-200302-15.xml
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert/56161
http://www.iss.net/security_center/static/11384.php Vendor Advisory
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:022
http://www.redhat.com/support/errata/RHSA-2003-041.html PatchVendor Advisory
http://www.redhat.com/support/errata/RHSA-2003-068.html
http://www.securityfocus.com/bid/6905

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2009-0388Tightvnc vulnerabilityMultiple integer signedness errors in (1) UltraVNC 1.0.2 and 1.0.5 and (2) TightVnc 1.3.9 allow remote VNC servers to cause a denial of service (heap…EPSS 13%9.8CVE-2021-42785Tightvnc classic buffer overflow vulnerabilityBuffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted Framebuffe…EPSS 2.3%9.8CVE-2019-8287Tightvnc classic buffer overflow vulnerabilityTightVNC code version 1.3.10 contains global buffer overflow in HandleCoRREBBP macro function, which can potentially result code execution. This atta…EPSS 19%9.8CVE-2019-15678Tightvnc heap-based buffer overflow vulnerabilityTightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result code execution.. This attack app…EPSS 12%9.8CVE-2019-15679Tightvnc heap-based buffer overflow vulnerabilityTightVNC code version 1.3.10 contains heap buffer overflow in InitialiseRFBConnection function, which can potentially result code execution. This att…EPSS 12%9.0CVE-2023-27830Tightvnc improper privilege management vulnerabilityTightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when e…EPSS 1.1%7.5CVE-2019-15680Tightvnc null pointer dereference vulnerabilityTightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS). This attack appear to…EPSS 2.7%7.5CVE-2002-1336Tightvnc vulnerabilityTightVNC before 1.2.6 generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authentication by sni…EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2002-1511), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.