CVE-2020-27821: Buffer Overflow
First published: Mon Nov 30 2020(Updated: )
A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU qemu | <5.2.0 | |
| Debian Debian Linux | =10.0 | |
| redhat/qemu | <5.2.0 | 5.2.0 |
| debian/qemu | 1:5.2+dfsg-11+deb11u3 1:5.2+dfsg-11+deb11u2 1:7.2+dfsg-7+deb12u7 1:9.2.0+ds-2 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-27821 https://nvd.nist.gov/vuln/detail/CVE-2020-27821 https://www.openwall.com/lists/oss-security/2020/12/16/6
- https://bugzilla.redhat.com/show_bug.cgi?id=1902651
- https://access.redhat.com/errata/RHBA-2021:0639
- https://access.redhat.com/errata/RHSA-2021:1762
- https://access.redhat.com/security/cve/cve-2020-27821
- http://www.openwall.com/lists/oss-security/2020/12/16/6
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
- https://security.netapp.com/advisory/ntap-20210115-0006/
- https://launchpad.net/bugs/cve/CVE-2020-27821
- https://git.qemu.org/?p=qemu.git;a=commit;h=4bfb024bc76973d40a359476dc0291f46e435442
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1904126
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1902651#c0
- https://www.openwall.com/lists/oss-security/2020/12/16/6
- https://git.qemu.org/?p=qemu.git;a=commitdiff;h=48564041a73adbbff52834f9edbe3806fceefab7
- https://security-tracker.debian.org/tracker/CVE-2020-27821
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27821
- https://nvd.nist.gov/vuln/detail/CVE-2020-27821
- https://ubuntu.com/security/CVE-2020-27821
Frequently Asked Questions
What is CVE-2020-27821?
CVE-2020-27821 is a vulnerability in the memory management API of QEMU that could lead to an out-of-bounds write access and crashing of the QEMU process.
How severe is CVE-2020-27821?
CVE-2020-27821 has a severity score of 5.7, which is considered medium severity.
Which software is affected by CVE-2020-27821?
QEMU version up to exclusive 5.2.0 is affected by CVE-2020-27821.
How can I fix CVE-2020-27821?
To mitigate CVE-2020-27821, upgrade QEMU to version 5.2.0 or higher.
Where can I find more information about CVE-2020-27821?
You can find more information about CVE-2020-27821 at the following references: [Link 1](https://www.cve.org/CVERecord?id=CVE-2020-27821), [Link 2](https://nvd.nist.gov/vuln/detail/CVE-2020-27821), [Link 3](https://www.openwall.com/lists/oss-security/2020/12/16/6), [Link 4](https://bugzilla.redhat.com/show_bug.cgi?id=1902651), [Link 5](https://access.redhat.com/errata/RHBA-2021:0639)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2020-27821
- agent/software-canonical-lookup
- agent/weakness
- agent/severity
- collector/nvd-cve
- source/NVD
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/remedy
- agent/tags
- agent/description
- agent/event
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- agent/trending
- vendor/qemu
- canonical/qemu qemu
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/10.0
- package-manager/redhat
- package-manager/debian