Security readout for executives and security teams
Plain-English summary
CVE-2025-5089 is an Arista EOS/CVX availability issue. Malformed messages between an EOS switch and a CVX server can crash agents, causing an EOS soft reset or CVX cluster instability. The cited scope is limited to EOS switches connected to CVX; standalone EOS switches are not affected.
Executive priority
Treat this as a high-priority operational resilience issue for Arista CVX environments. It is not described as a data theft or remote unauthenticated compromise issue, but a successful DoS could disrupt critical switching or CVX cluster stability.
Technical view
The issue is CWE-20 improper input validation in CVX client/server message handling. A malformed message from a connected CVX server can crash Sysdb on EOS, while a malformed message from a connected EOS switch can crash CVX server agents. The CVSS 4.0 score is 7.1 with high availability impact.
Likely exposure
Exposure is most likely in Arista environments using CVX clusters with EOS switches connected to CVX servers, especially versions listed in the source bundle. EOS switches not connected to CVX are explicitly stated as not impacted.
Exploitation context
The sources do not show KEV listing or active exploitation. The bundle says exploitation would require already having high-privilege access to a connected device to send custom TCP packets, reducing broad internet-driven risk but leaving insider or compromised-admin scenarios relevant.
Researcher notes
Key constraints are important: affected topology requires EOS connected to CVX, and the source bundle states high-privilege access to a connected device is needed. No exploit evidence, patch version, or workaround detail beyond vendor advisory review is provided in the supplied sources.
Mitigation direction
- Review Arista advisory 0126 for vendor-approved fixed versions or mitigations.
- Inventory CVX clusters and EOS switches connected to CVX servers.
- Prioritize upgrades or vendor guidance for listed affected EOS/CVX versions.
- Restrict privileged access to EOS and CVX management paths.
- Monitor for Sysdb crashes, EOS soft resets, or CVX cluster instability.
Validation and detection
- Identify EOS devices that are connected to CVX servers.
- Compare EOS/CVX versions against the affected versions in the advisory bundle.
- Confirm standalone EOS switches are not treated as affected exposure.
- Review logs for Sysdb agent crashes or unexpected soft resets.
- Check CVX server logs for agent crashes or cluster instability.
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-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2025-5089 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
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——AristaCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6AristaVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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/22868-security-advisory-0126CVE reference, Arista · 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.