TightVNC before 1.2.6 generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authenticati

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• tightvnc tightvnc1.2.0
• tightvnc tightvnc1.2.1
• tightvnc tightvnc1.2.3
• tightvnc tightvnc1.2.4
• tightvnc tightvnc1.2.5

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2019-8287TightVNC code version 1.3.10 contains global buffer overflow in HandleCoRREBBP macro function, which can potentially result code execution.
  45Plan
• CVE-2009-0388Multiple 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 serv
  44Plan
• CVE-2019-15679TightVNC code version 1.3.10 contains heap buffer overflow in InitialiseRFBConnection function, which can potentially result code execution.
  43Plan
• CVE-2019-15678TightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result code execution..
  43Plan
• CVE-2021-42785Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59
  40Plan
• CVE-2023-27830TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted fil
  36Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.