How severe is CVE-2019-8265?

CVE-2019-8265 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-8265 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-8265?

CVE-2019-8265 affects Uvnc Ultravnc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-8265?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-8265 published?

CVE-2019-8265 was published on 2019-03-08 and last updated on 2026-06-17.

CVE-2019-8265

CVE-2019-8265 is a critical-severity vulnerability in Uvnc Ultravnc with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Uvnc Ultravnc
Published: 2019-03-08
Last modified: 2026-06-17

Description

UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of SETPIXELS macro in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1208.

Frequently asked questions

What is CVE-2019-8265?: UltraVNC revision 1207 has multiple out-of-bounds access vulnerabilities connected with improper usage of SETPIXELS macro in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1208.
How severe is CVE-2019-8265?: CVE-2019-8265 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-8265 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-8265?: CVE-2019-8265 affects Uvnc Ultravnc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-8265?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-8265 published?: CVE-2019-8265 was published on 2019-03-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*

More vulnerabilities in Uvnc Ultravnc

CVE-2019-8280 — Critical (CVSS 9.8): UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside RAW decoder, which can potentially…
CVE-2019-8275 — Critical (CVSS 9.8): UltraVNC revision 1211 has multiple improper null termination vulnerabilities in VNC server code, which result in…
CVE-2019-8274 — Critical (CVSS 9.8): UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file transfer offer handler,…
CVE-2019-8273 — Critical (CVSS 9.8): UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file transfer request…
CVE-2019-8272 — Critical (CVSS 9.8): UltraVNC revision 1211 has multiple off-by-one vulnerabilities in VNC server code, which can potentially result in code…
CVE-2019-8271 — Critical (CVSS 9.8): UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file transfer handler, which…

All CVEs affecting Uvnc Ultravnc →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →