Security readout for executives and security teams
Plain-English summary
CVE-2025-8873 is a high-severity availability issue in Arista EOS when IPsec is configured. A malformed packet can stop the device from processing IPsec traffic, and automatic recovery may not restore it. The sources state non-IPsec traffic is not affected.
Executive priority
Treat this as urgent for sites where Arista EOS devices terminate critical IPsec VPNs. Business impact is service interruption for encrypted links, not full device compromise based on the provided evidence.
Technical view
Affected Arista EOS releases with IPsec configured can mishandle a specially crafted IPsec packet, causing the dataplane to stop processing all IPsec traffic. The control plane may reset the IPsec pipeline, but traffic may still fail to resume. CVSS 4.0 score is 8.7.
Likely exposure
Exposure appears limited to affected Arista EOS platforms that originate or terminate IPsec traffic. Environments not using IPsec on EOS, or only passing unrelated non-IPsec traffic, are not indicated as affected by the provided sources.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle. The issue was reported by an Arista customer, but the sources do not state active exploitation, public exploit availability, or broad scanning activity.
Researcher notes
The bundle provides impact scope and CVSS but not fixed versions, exploit indicators, or platform list details. Do not infer affected hardware beyond Arista’s advisory. Validation should focus on EOS version, IPsec configuration, and observed IPsec dataplane behavior.
Mitigation direction
- Identify Arista EOS devices running IPsec on affected release branches.
- Review Arista advisory 0127 for exact affected platforms and fixed guidance.
- Apply vendor-recommended EOS updates or mitigations when confirmed by Arista.
- Prioritize devices terminating business-critical VPN or site-to-site IPsec traffic.
- Monitor IPsec dataplane health and unexpected tunnel traffic loss.
Validation and detection
- Inventory EOS versions 4.29.0M through 4.33.0M in IPsec roles.
- Confirm whether each device originates or terminates IPsec traffic.
- Check Arista advisory 0127 for platform-specific exposure details.
- Review logs for control-plane IPsec pipeline reset events.
- Validate IPsec service continuity after vendor-directed remediation.
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2025-8873 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——AristaCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6AristaVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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
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/22869-security-advisory-0127CVE 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 Validation of Syntactic Correctness of Input
Improper Validation of Syntactic Correctness of Input represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.