Security readout for executives and security teams
Plain-English summary
This flaw affects Arista EOS devices before 4.20.2F. A remote BGP peer could trigger a routing software restart by sending a malformed BGP update. The main business risk is routing instability or outage on affected network devices, especially at internet or interconnect edges.
Executive priority
Prioritize review for internet edge, data-center interconnect, and service-provider-facing Arista devices. The issue is not documented here as actively exploited, but routing-plane restarts can create material availability impact.
Technical view
CVE-2018-5254 is a denial-of-service issue in Arista EOS before 4.20.2F. The CVE description attributes the trigger to a malformed path attribute in a BGP UPDATE message, causing the Rib agent to restart. The source bundle provides no CVSS score, CWE, or detailed affected CPE list.
Likely exposure
Exposure is most likely on Arista EOS routers or switches running BGP and versions earlier than 4.20.2F. Risk depends on whether untrusted or external BGP peers can send updates to the device.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Exploitation appears peer-scoped: an attacker would need a BGP peering position or another path to deliver malformed BGP UPDATE traffic accepted by the device.
Researcher notes
Evidence is limited to the CVE record and Arista advisory reference. No CVSS, CWE, exploit maturity, or detailed product matrix is included in the supplied bundle. Treat version and BGP exposure as the primary validation anchors.
Mitigation direction
- Upgrade affected Arista EOS devices to 4.20.2F or later vendor-recommended releases.
- Confirm current remediation guidance in Arista Security Advisory 33.
- Limit BGP sessions to explicitly trusted peers and expected interfaces.
- Apply routing-plane protections consistent with existing network design.
- Monitor for unexpected Rib agent restarts on affected devices.
Validation and detection
- Inventory Arista EOS versions across routing and switching infrastructure.
- Identify devices running EOS before 4.20.2F with BGP enabled.
- Review BGP neighbor configuration for untrusted or unnecessary peers.
- Check device logs for Rib agent restarts or BGP update parsing errors.
- Confirm remediation status against the Arista advisory.
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.
CVE-2018-5254 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.arista.com/en/support/advisories-notices/security-advisories/4403-security-advisory-33CVE reference · x_refsource_CONFIRM
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.