CVE-2020-27827

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.

Published: 2021-03-18 Last update: 2025-12-03 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-27827 is rated Moderate Risk (53/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.50%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-27827

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-28 0.68% 0.50% -0.18%
2 2026-04-26 0.41% 0.68% +0.27%
3 2025-11-21 — 0.41% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27827

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.1 2.0 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 6.9 [email protected]

Weakness enumeration for CVE-2020-27827

OS Trackers for CVE-2020-27827

vendor priority summary link
alpine — CVE-2020-27827: 2 source package rows (lldpd, openvswitch); 17 state rows across 8 repos (3.10-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 16, open 1. https://security.alpinelinux.org/vuln/CVE-2020-27827
debian not yet assigned CVE-2020-27827 not yet assigned priority: Debian including 2 source packages (lldpd, openvswitch), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2020-27827
gentoo low CVE-2020-27827: 1 GLSA(s) (202311-16), 1 atom(s) (net-misc/openvswitch); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-27827
redhat medium — https://access.redhat.com/security/cve/CVE-2020-27827
suse high CVE-2020-27827 severity important: SUSE including 155 source package names (liblldpctl4-1.0.12-1.2, libopenvswitch-2_11-0-2.11.5-3.12.1, …), 275 product×package rows across 56 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (56 product lines)): Fixed 275. https://www.suse.com/security/cve/CVE-2020-27827/
ubuntu medium CVE-2020-27827 medium priority: Ubuntu including 2 source packages (lldpd, openvswitch), 32 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 14, ignored 8, needs-triage 8, DNE 2. https://ubuntu.com/security/CVE-2020-27827

Affected software / configurations for CVE-2020-27827

Vendor Product Version Raw CPE
lldpd_project lldpd < 1.0.8 cpe:2.3:a:lldpd_project:lldpd:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.6.0, < 2.6.9 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.7.0, < 2.7.12 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.8.0, < 2.8.10 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.9.0, < 2.9.8 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.10.0, < 2.10.6 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.11.0, < 2.11.5 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.12.0, < 2.12.2 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.13.0, < 2.13.2 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
openvswitch openvswitch >= 2.14.0, < 2.14.1 cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
redhat openshift_container_platform 4.0 cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
redhat openstack 10 cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*
redhat openstack 13 cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
redhat virtualization 4.0 cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
fedoraproject fedora 33 cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
siemens simatic_hmi_unified_comfort_panels_firmware < 17 cpe:2.3:o:siemens:simatic_hmi_unified_comfort_panels_firmware:*:*:*:*:*:*:*:*
siemens simatic_net_cp_1243-1_firmware — cpe:2.3:o:siemens:simatic_net_cp_1243-1_firmware:-:*:*:*:*:*:*:*
siemens simatic_net_cp_1243-8_irc_firmware — cpe:2.3:o:siemens:simatic_net_cp_1243-8_irc_firmware:-:*:*:*:*:*:*:*
siemens simatic_net_cp_1542sp-1_firmware — cpe:2.3:o:siemens:simatic_net_cp_1542sp-1_firmware:-:*:*:*:*:*:*:*
siemens simatic_net_cp_1542sp-1_irc_firmware — cpe:2.3:o:siemens:simatic_net_cp_1542sp-1_irc_firmware:-:*:*:*:*:*:*:*
siemens simatic_net_cp_1543-1_firmware — cpe:2.3:o:siemens:simatic_net_cp_1543-1_firmware:-:*:*:*:*:*:*:*
siemens simatic_net_cp_1543sp-1_firmware — cpe:2.3:o:siemens:simatic_net_cp_1543sp-1_firmware:-:*:*:*:*:*:*:*
siemens simatic_net_cp_1545-1_firmware — cpe:2.3:o:siemens:simatic_net_cp_1545-1_firmware:-:*:*:*:*:*:*:*
siemens tim_1531_irc_firmware < 2.2 cpe:2.3:o:siemens:tim_1531_irc_firmware:*:*:*:*:*:*:*:*
siemens sinumerik_one_firmware < 2.0.1 cpe:2.3:o:siemens:sinumerik_one_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-27827

URL Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1921438 Issue Tracking Mitigation Patch Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdf Patch 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.html Mailing List Mitigation Vendor Advisory
https://security.gentoo.org/glsa/202311-16
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-07 Third Party Advisory US Government Resource
cvelogic Threat Intelligence