CVE-2020-27827
Specially crafted LLDP packets can cause memory to be lost when allocating data to handle specific optional TLVs, potentially causing a denial of service.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.23% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- lldpd project/lldpd · openvswitch/openvswitch · redhat/openshift container platform · redhat/openstack · redhat/virtualization · redhat/enterprise linux · fedoraproject/fedora · siemens/simatic hmi unified comfort panels firmware · siemens/simatic net cp 1243-1 firmware · siemens/simatic net cp 1243-8 irc firmware · siemens/simatic net cp 1542sp-1 firmware · siemens/simatic net cp 1542sp-1 irc firmware · siemens/simatic net cp 1543-1 firmware · siemens/simatic net cp 1543sp-1 firmware · siemens/simatic net cp 1545-1 firmware · siemens/tim 1531 irc firmware · siemens/sinumerik one firmware
- Source
- secalert@redhat.com
EPSS 3.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.