CVE-2020-29074
scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.
02 Description
scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.77% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 78.0% of scored records. A rank, not a probability.
- NVD base score
- 8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-11-25 22:06Z5 YR AGO
- Last updated
- 2024-08-04 16:48Z2 YR AGO
- Reserved
- 2020-11-25
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-732Incorrect Permission Assignment for Critical ResourceClass
- Data version
- 5.1
- Document digest
- 977f1795d39be11633e397b658627c67d682b3867334e870f5d101bbe000204c
05 Affected products
06 References
- github.comhttps://github.com/LibVNC/x11vnc/commit/69eeb9f7baa14ca03b16c9de821f9876def7a36a
- www.debian.orgDSA-4799https://www.debian.org/security/2020/dsa-4799
- lists.debian.org[debian-lts-announce] 20201210 [SECURITY] [DLA 2490-1] x11vnc security updatehttps://lists.debian.org/debian-lts-announce/2020/12/msg00018.html
- lists.fedoraproject.orgFEDORA-2021-c5b679877ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MHVXHZE3YIP4RTWGQ24IDBSW44XPRDOC/
- lists.fedoraproject.orgFEDORA-2021-93911302d6https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H2FLWSVH32O6JXLRQBYDQLP7XRSTLUPQ/
- lists.fedoraproject.orgFEDORA-2021-069c0c3950https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PZL6NQTNK5PT63D2JX5YVV5OLUL76S5C/
07 Fixed in
Arch Linux
- x11vnc Fixed in 1:0.9.16-4
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- x11vnc Fixed in 0.9.16-5
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- x11vnc Fixed in 0.9.16-5
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- x11vnc Fixed in 0.9.16-5
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- x11vnc No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.