Red Hat Enterprise Linux (python-lxml): Schwachstelle ermöglicht Cross-Site Scripting
WID-SEC-2022-0931 · first 19.05.2021 · updated 21.09.2026 · CVSS 6,1
What it is about
Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux im python-lxml Modul ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Cross-Site Scripting Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Amazon Linux 2
- SUSE Linux
- Oracle Linux
- Red Hat Enterprise Linux 8
- EMC Avamar
- IBM QRadar SIEM <7.5.0 UP8
- Dell NetWorker virtual
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- IBM QRadar SIEM 7.5.0 UP8
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- RedHat Security Advisory RHSA-2021:1898 vom 2021-05-18 access.redhat.com
- Red Hat Security Advisory RHSA-2021:2479 vom 2021-06-17 access.redhat.com
- Amazon Linux Security Advisory ALAS-2021-1666 vom 2021-06-23 alas.aws.amazon.com
- Red Hat Security Advisory RHSA-2021:3254 vom 2021-08-25 access.redhat.com
- Oracle Linux Security Advisory ELSA-2022-9341 vom 2022-04-28 linux.oracle.com
- PoC auf advisory.checkmarx.net vom 2022-08-07 advisory.checkmarx.net
- SUSE Security Update SUSE-SU-2022:3460-1 vom 2022-09-29 lists.suse.com
- SUSE Security Update SUSE-SU-2022:3461-1 vom 2022-09-29 lists.suse.com
- SUSE Security Update SUSE-SU-2022:3836-1 vom 2022-11-01 lists.suse.com
- IBM Security Bulletin 7145367 vom 2024-03-27 www.ibm.com
- Dell Security Advisory DSA-2024-198 vom 2024-05-08 www.dell.com
- Oracle Linux Security Advisory ELSA-2026-67943 vom 2026-09-18 linux.oracle.com
CVE: CVE-2020-27783
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.