CVE-2021-33656
Sun Fontmanager Kernel Out-of-Bounds Write
Description
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
INFO
Published Date :
July 18, 2022, 3:15 p.m.
Last Modified :
April 2, 2025, 6:33 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2021-33656
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the affected kernel packages.
- Update the affected Linux packages.
- Upgrade hyperv-daemons packages if applicable.
- Update Nutanix AOS software to the recommended version.
Public PoC/Exploit Available at Github
CVE-2021-33656 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-33656.
| URL | Resource |
|---|---|
| http://www.openwall.com/lists/oss-security/2022/07/19/3 | Mailing List Patch Third Party Advisory |
| https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html | Mailing List Third Party Advisory |
| https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel | Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2022/07/19/3 | Mailing List Patch Third Party Advisory |
| https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html | Mailing List Third Party Advisory |
| https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-33656 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-33656
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Map Vulnerabilities into Different Layers of the Container Image
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-33656 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-33656 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CPE Deprecation Remap by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:huawei:openeuler:20.03:-:*:*:lts:*:*:* OR *cpe:2.3:o:openatom:openeuler:20.03:-:*:*:lts:*:*:* -
CPE Deprecation Remap by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:huawei:openeuler:20.03:sp1:*:*:lts:*:*:* OR *cpe:2.3:o:openatom:openeuler:20.03:sp1:*:*:lts:*:*:* -
CPE Deprecation Remap by [email protected]
Apr. 02, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:huawei:openeuler:20.03:sp3:*:*:lts:*:*:* OR *cpe:2.3:o:openatom:openeuler:20.03:sp3:*:*:lts:*:*:* -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2022/07/19/3 Added Reference https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch Added Reference https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html Added Reference https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Oct. 29, 2022
Action Type Old Value New Value Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 02, 2022
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html [No Types Assigned] -
Reanalysis by [email protected]
Sep. 14, 2022
Action Type Old Value New Value Removed CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CVSS V3.1 NIST AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
Initial Analysis by [email protected]
Jul. 28, 2022
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type http://www.openwall.com/lists/oss-security/2022/07/19/3 No Types Assigned http://www.openwall.com/lists/oss-security/2022/07/19/3 Mailing List, Patch, Third Party Advisory Changed Reference Type https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch No Types Assigned https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch Patch, Third Party Advisory Changed Reference Type https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel No Types Assigned https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel Third Party Advisory Added CWE NIST CWE-787 Added CPE Configuration OR *cpe:2.3:o:huawei:openeuler:20.03:-:*:*:lts:*:*:* *cpe:2.3:o:huawei:openeuler:20.03:sp1:*:*:lts:*:*:* *cpe:2.3:o:huawei:openeuler:20.03:sp3:*:*:lts:*:*:* Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.10.127 -
CVE Modified by [email protected]
Jul. 19, 2022
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2022/07/19/3 [No Types Assigned]
Vulnerability Scoring Details
Base CVSS Score: 6.8
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.03 }} 0.00%
score
0.05612
percentile