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Vulnerability record · CVE-2017-7393 · published 1 April 2017

CVE-2017-7393: Tigervnc double free vulnerability

Tigervnc · Tigervnc

In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or potentially code execution.

8.8 CVSS 3.0 High EPSS 1.8% · top 22.1% CWE-415 · Double free
8.8CVSS 3.0 base score, v2 6.5
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or potentially code execution.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/438 Issue TrackingPatchThird Party Advisory
https://security.gentoo.org/glsa/201801-13
http://www.securityfocus.com/bid/97305
https://access.redhat.com/errata/RHSA-2017:2000
https://github.com/TigerVNC/tigervnc/pull/438 Issue TrackingPatchThird Party Advisory
https://security.gentoo.org/glsa/201801-13

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Related vulnerabilities

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

9.8CVE-2026-34352Tigervnc incorrect permission assignment vulnerabilityIn TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application crash, b…EPSS 0.42%9.8CVE-2014-0011Tigervnc out-of-bounds write vulnerabilityMultiple heap-based buffer overflows in the ZRLE_DECODE function in common/rfb/zrleDecode.h in TigerVNC before 1.3.1, when NDEBUG is enabled, allow r…EPSS 2.5%9.8CVE-2017-5581Tigervnc memory buffer overflow vulnerabilityBuffer overflow in the ModifiablePixelBuffer::fillRect function in TigerVNC before 1.7.1 allows remote servers to execute arbitrary code via an RRE m…EPSS 4.2%9.8CVE-2014-8241Tigervnc null pointer dereference vulnerabilityXRegion in TigerVNC allows remote VNC servers to cause a denial of service (NULL pointer dereference) by leveraging failure to check a malloc return …EPSS 3.1%8.1CVE-2020-26117Tigervnc improper certificate validation vulnerabilityIn rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificate…EPSS 3.1%7.8CVE-2025-26599Tigervnc vulnerabilityAn access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backi…EPSS 0.40%7.8CVE-2025-26600Tigervnc use after free vulnerabilityA use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the events queued for that device remain while th…EPSS 0.39%7.8CVE-2025-26601Tigervnc use after free vulnerabilityA use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, chang…EPSS 0.39%

Source: NIST National Vulnerability Database (record CVE-2017-7393), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.