Security readout for executives and security teams
Plain-English summary
This is a critical Arista EOS issue affecting switches with OpenConfig configured. A low-privileged network actor may be able to submit a gNMI Set request that should have been rejected, causing unexpected switch configuration changes. The business risk is unauthorized configuration drift affecting network integrity and availability.
Executive priority
Treat this as urgent for Arista-managed network environments because unauthorized switch configuration changes can disrupt operations. Prioritize internet-exposed or widely reachable management planes first, then complete fleet-wide validation and vendor-guided remediation.
Technical view
CVE-2024-27890 is mapped to CWE-306 and scored CVSS 9.6. The source states that affected EOS platforms with OpenConfig configured may accept a gNMI Set request incorrectly. CVSS indicates network access, low privileges, no user interaction, changed scope, high integrity impact, and high availability impact.
Likely exposure
Exposure is most likely on Arista EOS 4.24.0 through 4.29.0 listed affected versions where OpenConfig/gNMI management is configured. Internet or broadly reachable management interfaces would increase operational risk, but the bundle does not identify specific deployment defaults.
Exploitation context
The provided sources do not state active exploitation, and CISA KEV is false in the bundle. The CVSS vector indicates exploitation requires network reachability and low privileges, not unauthenticated access or user interaction.
Researcher notes
Evidence is limited to the CVE record and Arista advisory reference in the bundle. The vulnerability centers on improper rejection of gNMI Set requests when OpenConfig is configured. The bundle does not provide exploit details, proof-of-concept status, fixed versions, or concrete workaround text.
Mitigation direction
- Review Arista Security Advisory 0099 for fixed releases and vendor workarounds.
- Inventory Arista EOS devices running the listed affected versions.
- Identify devices with OpenConfig or gNMI configured.
- Prioritize remediation for management interfaces reachable beyond trusted administration networks.
- Apply only vendor-confirmed fixes or mitigations from Arista guidance.
Validation and detection
- Check EOS versions against the affected version list in the advisory.
- Confirm whether OpenConfig and gNMI are configured on each device.
- Review configuration-change logs for unexpected switch configuration changes.
- Verify management-plane exposure is limited to trusted administrative paths.
- Track remediation status against Arista advisory guidance.
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-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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-2024-27890 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
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/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
2 official scoresWe 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:L/UI:N/S:C/C:N/I:H/A:H3.15.8AristaCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N——AristaVulnerability scoring details
Base CVSS 4.0 score
7.2HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.arista.com/en/support/advisories-notices/security-advisory/19862-security-advisory-0099CVE reference, Arista
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.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.