Security readout for executives and security teams
Plain-English summary
CVE-2020-27827 is an availability issue in Open vSwitch LLDP handling. Specially crafted LLDP packets can trigger memory loss while processing optional TLVs, potentially exhausting resources and causing denial of service. It matters most for systems where Open vSwitch or lldpd processes untrusted LLDP traffic.
Executive priority
Treat as a high-priority availability risk for network virtualization and operational environments using affected Open vSwitch or lldpd versions. It is not shown as actively exploited in the provided evidence, but unauthenticated network reachability and denial-of-service impact justify prompt inventory and vendor-led remediation.
Technical view
The CVE describes CWE-400 resource consumption in multiple Open vSwitch and lldpd versions. Network-reachable LLDP packet processing can leak memory during allocation for specific optional TLVs. CVSS 3.1 is 7.5 with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is likely where affected Open vSwitch or lldpd versions are deployed and LLDP traffic can reach them. The bundle lists lldpd 1.0.8 and Open vSwitch 2.6.9 through 2.14.1 patch lines as affected. Siemens and CISA references indicate possible ICS product relevance.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation evidence. The issue is remotely triggerable over network-reachable LLDP handling, but the sources provided do not establish public exploitation, exploit availability, or observed attacks.
Researcher notes
The key technical condition is memory loss during LLDP optional TLV processing. Source evidence supports denial-of-service potential, not confidentiality or integrity impact. Avoid assuming fixed versions beyond vendor advisories because the supplied bundle names affected versions but does not include complete remediation details.
Mitigation direction
- Inventory Open vSwitch and lldpd versions against the affected list.
- Apply vendor or distribution updates referenced by Red Hat, Fedora, Gentoo, Siemens, or CISA.
- If fixes are unclear, follow current vendor guidance for your product line.
- Prioritize systems where LLDP packets can reach Open vSwitch handling paths.
- Monitor availability and memory behavior until updates are confirmed.
Validation and detection
- Confirm deployed Open vSwitch and lldpd package versions.
- Check whether LLDP handling is enabled on exposed interfaces.
- Map ICS assets against Siemens and CISA affected-product guidance.
- Review logs and monitoring for unexplained memory growth or service restarts.
- Verify remediation through package inventory after updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-27827 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.redhat.com/show_bug.cgi?id=1921438CVE reference
- https://mail.openvswitch.org/pipermail/ovs-dev/2021-January/379471.htmlCVE reference
- https://cert-portal.siemens.com/productcert/pdf/ssa-941426.pdfCVE reference
- https://us-cert.cisa.gov/ics/advisories/icsa-21-194-07CVE reference
- FEDORA-2023-88991d2713CVE reference · vendor-advisory
- FEDORA-2023-c0c184a019CVE reference · vendor-advisory
- FEDORA-2023-3e4feeadecCVE reference · vendor-advisory
- GLSA-202311-16CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.