CVE-2020-29074

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other...

8.8 HighFix available

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.78%Up 0.3 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: CVE-2020-29074
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-732
Updated: 2026-11-02

CVE List No score

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: CVE-2020-29074
Updated: 2026-11-02

EUVDEUVD-2020-21456 No score

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: EUVD-2020-21456
Updated: 2026-11-03

GitHub AdvisoriesGHSA-qjv2-p92g-q4wq No score

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other...

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: GHSA-qjv2-p92g-q4wq
Weakness: CWE-862
Updated: 2026-11-02

OSVALPINE-CVE-2020-29074 8.8

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: ALPINE-CVE-2020-29074
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-03

OSV 8.8

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: CVE-2020-29074
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

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OSVDEBIAN-CVE-2020-29074 8.8

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: DEBIAN-CVE-2020-29074
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-29074 8.8

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

Record: UBUNTU-CVE-2020-29074
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2020-0454 No score

Updated x11vnc package fixes a security vulnerability

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user. (CVE-2020-29074)

Record: MGASA-2020-0454
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11496-1 No score

veyon-4.6.0-1.1 on GA media

These are all security issues fixed in the veyon-4.6.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11496-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`x11vnc` Alpine:v3.12	before 0.9.16-r1	0.9.16-r1
`x11vnc` Alpine:v3.13	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.14	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.15	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.16	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.17	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.18	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.19	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.20	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.21	before 0.9.16-r2	0.9.16-r2

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Affected packages
Package	Affected	Fixed
`x11vnc` Alpine:v3.22	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.23	before 0.9.16-r2	0.9.16-r2
`x11vnc` Alpine:v3.24	before 0.9.16-r2	0.9.16-r2
`x11vnc` Debian:12	before 0.9.16-5	0.9.16-5
`x11vnc` Debian:13	before 0.9.16-5	0.9.16-5
`x11vnc` Debian:14	before 0.9.16-5	0.9.16-5
`x11vnc` Debian:9	before 0.9.13-2+deb9u2, plus listed versions 0.9.13-20.9.13-2+deb9u1	0.9.13-2+deb9u2
`x11vnc` Debian:10	before 0.9.13-6+deb10u1, plus listed versions 0.9.13-6	0.9.13-6+deb10u1
`x11vnc` Mageia:7	before 0.9.16-1.1.mga7	0.9.16-1.1.mga7
`x11vnc` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 0.9.13-60.9.16-30.9.16-3ubuntu0.1~esm1	None known
`veyon` openSUSE:Tumbleweed	before 4.6.0-1.1	4.6.0-1.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected, aliases, references	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-29074 is a high vulnerability (CVSS 8.8) in X11vnc Project X11vnc, published November 25, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.78%, the 78th percentile. Fixed in x11vnc 0.9.16-r1.

References

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