No exploitation reportedFix available

CVE-2020-27827

Q: Is CVE-2020-27827 actively exploited?

Active exploitation of CVE-2020-27827 has not been confirmed. Its EPSS score was 3.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-27827?

CVE-2020-27827 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-03-18
Fixed in2.14.1 · 2.13.2 · 2.12.2 · 2.11.5 · 2.10.6 · 2.9.8
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2021-03-1817:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-27827?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27827?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Openvswitch

Branch	Affected	Fixed in	Source
2.14	≥ 2.14.0, < 2.14.1	2.14.1	NVD
2.13	≥ 2.13.0, < 2.13.2	2.13.2	NVD
2.12	≥ 2.12.0, < 2.12.2	2.12.2	NVD
2.11	≥ 2.11.0, < 2.11.5	2.11.5	NVD
2.10	≥ 2.10.0, < 2.10.6	2.10.6	NVD
2.9	≥ 2.9.0, < 2.9.8	2.9.8	NVD
2.8	≥ 2.8.0, < 2.8.10	2.8.10	NVD
2.7	≥ 2.7.0, < 2.7.12	2.7.12	NVD
2.6	≥ 2.6.0, < 2.6.9	2.6.9	NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
7.0	= 7.0	no fix published	NVD
8.0	= 8.0	no fix published	NVD

Redhat openstack

Branch	Affected	Fixed in	Source
10.x	= 10	no fix published	NVD
13.x	= 13	no fix published	NVD

14 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

lldpdAlmaLinux:9all versions · fixed in 1.0.18-4.el9and 1 other package

Vendor advisories

ICSA-21-194-07 CISA17 known affected
Siemens Industrial Products LLDP (Update D)
SIMATIC CP 1243-1 (6GK7243-1BX30-0XE0) · SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) · SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) · +14 more

Full record on NVD

Fix

Update Openvswitch to 2.14.1 · 2.13.2 · 2.12.2 · 2.11.5 · 2.10.6 · 2.9.8 · 2.8.10 · 2.7.12
Vendor fix CISA ICSA-21-194-07 · 6 productsUpdate to V2.2.28 or later version
Vendor fix CISA ICSA-21-194-07 · 1 productUpdate to V17 or later version
Vendor fix CISA ICSA-21-194-07 · 1 productUpdate to V2.0.1 or later version Please contact your Siemens representative for information on how to obtain the update.
Vendor fix CISA ICSA-21-194-07 · 4 productsUpdate to V3.3.46 or later version
Vendor fix CISA ICSA-21-194-07 · 1 productUpdate to V1.1 or later version
Vendor fix CISA ICSA-21-194-07 · 2 productsUpdate to V3.0 or later version

Advisories and patches

bugzilla.redhat.comMitigation · Patch
cert-portal.siemens.comPatch
mail.openvswitch.orgMitigation · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-06-04
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52025-06-04
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.1read 2026-10-23
CNAweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score3.2 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-03-18
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-27827?

Is CVE-2020-27827 actively exploited?

Active exploitation of CVE-2020-27827 has not been confirmed. Its EPSS score was 3.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-27827?

CVE-2020-27827 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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