What’s Vulnerable › Vulnerabilities
CVE-2020-27827
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 3.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-03-18 · updated 2026-06-17
- Weakness: CWE-400
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.
Affected products
- Fedoraproject Fedora: 33
- lldpd: before 1.0.8 — fixed in 1.0.8
- Openvswitch: from 2.6.0 before 2.6.9; from 2.7.0 before 2.7.12; from 2.8.0 before 2.8.10; from 2.9.0 before 2.9.8; from 2.10.0 before 2.10.6; from 2.11.0 before 2.11.5 — fixed in 2.10.6, 2.11.5, 2.12.2, 2.13.2, 2.14.1, 2.6.9
- Red Hat Enterprise Linux: 7.0, 8.0
- Red Hat OpenShift Container Platform 4.18: 4.0
- OpenStack: 10, 13
- RedHat Virtualization: 4.0
- Siemens Simatic Hmi Unified Comfort Panels Firmware: before 17 — fixed in 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 Sinumerik One Firmware: before 2.0.1 — fixed in 2.0.1
- Siemens AG TIM 1531 IRC: before 2.2 — fixed in 2.2
How to fix
Upgrade to a fixed version: lldpd 1.0.8; Openvswitch 2.10.6, 2.11.5, 2.12.2, 2.13.2; Siemens Simatic Hmi Unified Comfort Panels Firmware 17; Siemens Sinumerik One Firmware 2.0.1; Siemens AG TIM 1531 IRC 2.2. Check the vendor advisory for mitigations.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1921438
- https://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdf
- 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.html
- https://security.gentoo.org/glsa/202311-16
- https://us-cert.cisa.gov/ics/advisories/icsa-21-194-07
- https://bugzilla.redhat.com/show_bug.cgi?id=1921438
- https://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdf
- 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/
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