CVE-2020-27827

Name: CVE-2020-27827
Creator: NVD / NIST
Published: 2021-03-18T17:15:13.51+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.23%

Last modified Jun 17, 2026

CVE-2020-27827 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in multiple versions of OpenvSwitch. Specially crafted LLDP packets can cause memory to be lost when allocating data to handle specific optional TLVs, potentially causing a denial of service. EPSS estimates a 3.23% chance of exploitation in the next 30 days.

Description

A flaw was found in multiple versions of OpenvSwitch. Specially crafted LLDP packets can cause memory to be lost when allocating data to handle specific optional TLVs, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.23%

86.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Lldpd Project	Lldpd	< 1.0.8
Openvswitch	Openvswitch	>= 2.6.0, < 2.6.9
Openvswitch	Openvswitch	>= 2.7.0, < 2.7.12
Openvswitch	Openvswitch	>= 2.8.0, < 2.8.10
Openvswitch	Openvswitch	>= 2.9.0, < 2.9.8
Openvswitch	Openvswitch	>= 2.10.0, < 2.10.6
Openvswitch	Openvswitch	>= 2.11.0, < 2.11.5
Openvswitch	Openvswitch	>= 2.12.0, < 2.12.2
Openvswitch	Openvswitch	>= 2.13.0, < 2.13.2
Openvswitch	Openvswitch	>= 2.14.0, < 2.14.1
Redhat	Openshift Container Platform	4.0
Redhat	Openstack	10
Redhat	Openstack	13
Redhat	Virtualization	4.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Fedoraproject	Fedora	33
Siemens	Simatic Hmi Unified Comfort Panels Firmware	< 17
Siemens	Simatic Net Cp 1243-1 Firmware	All versions
Siemens	Simatic Net Cp 1243-8 Irc Firmware	All versions
Siemens	Simatic Net Cp 1542sp-1 Firmware	All versions
Siemens	Simatic Net Cp 1542sp-1 Irc Firmware	All versions
Siemens	Simatic Net Cp 1543-1 Firmware	All versions
Siemens	Simatic Net Cp 1543sp-1 Firmware	All versions
Siemens	Simatic Net Cp 1545-1 Firmware	All versions
Siemens	Tim 1531 Irc Firmware	< 2.2
Siemens	Sinumerik One Firmware	< 2.0.1

References

https://bugzilla.redhat.com/show_bug.cgi?id=1921438Issue Tracking, Mitigation, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdfPatch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3T5XHPOGIPWCRRPJUE6P3HVC5PTSD5JS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYA4AMJXCNF6UPFG36L2TPPT32C242SP/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKQWHG2SZJZSGC7PXVDAEJYBN7ESDR7D/
https://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.htmlMailing List, Mitigation, Vendor Advisory
https://security.gentoo.org/glsa/202311-16
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-07Third Party Advisory, US Government Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1921438Issue Tracking, Mitigation, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdfPatch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3T5XHPOGIPWCRRPJUE6P3HVC5PTSD5JS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JYA4AMJXCNF6UPFG36L2TPPT32C242SP/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKQWHG2SZJZSGC7PXVDAEJYBN7ESDR7D/
https://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.htmlMailing List, Mitigation, Vendor Advisory
https://security.gentoo.org/glsa/202311-16
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-07Third Party Advisory, US Government Resource

Timeline

Published: Mar 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27827?

How severe is CVE-2020-27827?

CVE-2020-27827 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.23% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27827?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27827?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST