HOMEVULNERABILITIESCVE-2020-27827
HIGH

CVE-2020-27827

CWE-400Published: March 18, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-27827 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
lldpd_project1 product(s)
lldpd
openvswitch1 product(s)
openvswitch
Red Hat4 product(s)
openshift container platformopenstackvirtualizationenterprise linux
siemens20 product(s)
simatic hmi unified comfort panels firmwaresimatic hmi unified comfort panelssimatic net cp 1243-1 firmwaresimatic net cp 1243-1simatic net cp 1243-8 irc firmwaresimatic net cp 1243-8 ircsimatic net cp 1542sp-1 firmwaresimatic net cp 1542sp-1simatic net cp 1542sp-1 irc firmwaresimatic net cp 1542sp-1 ircsimatic net cp 1543-1 firmwaresimatic net cp 1543-1+8
Source: NVD CPE · 29 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1921438
PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdf
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1921438
PATCHhttps://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdf
ADVISORYhttps://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.html
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-194-07
ADVISORYhttps://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.html
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-194-07

All References (16)

→
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

Quick Facts

CVE IDCVE-2020-27827
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
Affected5 vendor(s)
PublishedMar 18, 2021

Related CVEs (CWE-400)

CVE-2015-4412
9.8
CVE-2017-9119
9.8
CVE-2023-30769
9.8
CVE-2017-1000378
9.8
CVE-2023-28507
9.8
CVE-2019-10952
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27827 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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