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Fencer Vulns
high 8.8

CVE-2020-29074 json

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

published 2020-11-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21456

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

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

Patch / fix

  • x11vnc Debian 14, Debian 13, Debian 12 0.9.16-5

debian advisories DEBIAN-CVE-2020-29074

  • veyon openSUSE Tumbleweed 4.6.0-1.1

opensuse advisories openSUSE-SU-2024:11496-1

  • x11vnc Alpine 3.12 0.9.16-r1
  • x11vnc Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 0.9.16-r2

alpine advisories ALPINE-CVE-2020-29074

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • x11vnc Arch Linux 1:0.9.16-4

arch linux advisories AVG-1345

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-29074 updated cvss 8.8

x11vnc: insecure permissions on shm

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.78% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.