Out-of-bounds read in TightVNC Viewer ZRLE palette decoding
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| GlavSoft | TightVNC | unaffected |
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No data.
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Glavsoft | Tightvnc |
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Vendor Solution
Upgrade TightVNC for Windows to version 2.8.88 or later.
Vendor Workaround
Connect only to trusted VNC servers until the viewer is upgraded.
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.236% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Glavsoft
Glavsoft tightvnc |
|
| Vendors & Products |
Glavsoft
Glavsoft tightvnc |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An out-of-bounds read vulnerability in the ZRLE decoder of GlavSoft TightVNC Viewer for Windows before 2.8.88 allows a malicious or compromised VNC server to read heap memory beyond the palette allocation and crash the viewer by sending ZRLE-encoded tiles whose palette indices exceed the declared palette size. readPaletteRleTile() and readPackedPaletteTile() use the attacker-supplied index to look up colours without validating it against the palette size; out-of-bounds heap data is copied into the framebuffer (garbled display) or the read faults, terminating the viewer. | |
| Title | Out-of-bounds read in TightVNC Viewer ZRLE palette decoding | |
| Weaknesses | CWE-125 | |
| References |
| |
| Metrics |
cvssV3_1
|