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Vulnerability Details :

CVE-2025-5088

Summary
Assigner-Arista
Assigner Org ID-c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7
Published At-05 Jun, 2026 | 15:58
Updated At-05 Jun, 2026 | 15:58
Rejected At-
Credits

Arista CloudVision Exchange (CVX) Cluster Privilege Escalation via MCS Redis Session

An authenticated Redis session could be used to obtain full root access to all servers in the CVX cluster. Note that this would require an attacker to have both network access to the Redis service on a CVX server and the Redis password. Please note that all Redis communication, including authentication, occurs over plaintext in the present day. TLS support is tracked under RFE1294850.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Arista
Assigner Org ID:c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7
Published At:05 Jun, 2026 | 15:58
Updated At:05 Jun, 2026 | 15:58
Rejected At:
â–¼CVE Numbering Authority (CNA)
Arista CloudVision Exchange (CVX) Cluster Privilege Escalation via MCS Redis Session

An authenticated Redis session could be used to obtain full root access to all servers in the CVX cluster. Note that this would require an attacker to have both network access to the Redis service on a CVX server and the Redis password. Please note that all Redis communication, including authentication, occurs over plaintext in the present day. TLS support is tracked under RFE1294850.

Affected Products
Vendor
Arista Networks, Inc.Arista Networks
Product
EOS / CloudVision eXchange (CVX)
Platforms
  • CloudVision eXchange
  • virtual or physical appliance
Default Status
unaffected
Versions
Affected
  • From 4.34.0F through 4.34.1F (custom)
  • From 4.33.0M through 4.33.4M (custom)
  • From 4.32.0M through 4.32.6M (custom)
  • From 4.31.0M through 4.31.8M (custom)
  • From 4.30.0 before 4.31.0 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-269CWE-269: Improper Privilege Management
Type: CWE
CWE ID: CWE-269
Description: CWE-269: Improper Privilege Management
Metrics
VersionBase scoreBase severityVector
3.18.3HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-233CAPEC-233 Privilege Escalation
CAPEC ID: CAPEC-233
Description: CAPEC-233 Privilege Escalation
Solutions

The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades CVE-2025-5088 has been fixed in the following releases: * 4.34.2F and later releases in the 4.34.x train * 4.33.5M and later releases in the 4.33.x train * 4.32.7M and later releases in the 4.32.x train * 4.31.9M and later releases in the 4.31.x train

Configurations

In order to be vulnerable to CVE-2025-5088, the following condition must be met: MCS Service must be configured: cvx1#show cvx service mcs Mcs Status: Enabled Supported versions: 1 Switch Status Negotiated Version ------ ------- ------------------ <Switch1> Enabled 1 cvx1#show running-config section mcs cvx service mcs redis password 7 03054902151B20 no shutdown If MCS Service is not configured there is no exposure to this issue and the message will look like: cvx1#show cvx service mcs Mcs Status: Disabled Supported versions: 1 Switch Status Negotiated Version ------ -------- ------------------ <Switch1> Disabled

Workarounds

To run the redis-server as a dedicated "redis" user and group on the CVX server, follow these steps, ensuring all changes are applied correctly and the service restarts smoothly. This approach enhances security by isolating the Redis process with its own user and group permissions. Please ensure that these mitigation steps are tested thoroughly in a non-production environment prior to production deployment. Log in to the CVX Server Access your CVX server (e.g. using SSH) using the appropriate credentials. This is the initial point of access for all subsequent configuration changes. Stop Redis Before Applying Changes It is crucial to stop Redis to prevent data corruption or conflicts while modifying its configuration. This is achieved by unconfiguring the Redis password on the MCS service. Executing no redis password stops the Redis service by removing its authentication credentials, which prevents it from running. cvx>enable cvx#config cvx(config)#cvx cvx(config-cvx)#service mcs cvx(config-cvx-mcs)#no redis password cvx(config-cvx-mcs)# Edit the redis.service Systemd Service File This step involves modifying the systemd service file for Redis to specify the dedicated user and group under which Redis will run. First, transition to bash mode from the CVX configuration prompt: cvx(config-cvx-mcs)#bash Once in bash, use sudo nano to edit the redis.service file: [cvx ~]$sudo nano /etc/systemd/system/redis.service Add 'User' and 'Group' Directives to the [Service] Section Within the redis.service file, locate the [Service] section and add the following lines: [Service] User=redis Group=redis This modification ensures that when the redis-server starts, it will execute under the context of the redis user and redis group, thereby enforcing stricter access controls and enhancing system security. Save and exit the editor. Change Ownership of the Redis Log File To ensure the redis user has appropriate write permissions for its log file, change the ownership of /var/log/redis/redis.log to the redis user and group. [cvx ~]$sudo chown redis:redis /var/log/redis/redis.log This step is required for the Redis server to be able to write logs once it restarts under the new user and group. Restart the Redis with New Changes After making all necessary modifications, restart the Redis to apply the new configuration. This is done by reconfiguring the Redis password, which will bring the service back online. First, exit bash mode: [cvx ~]$exit Then, reconfigure the Redis password: cvx(config-cvx-mcs)#redis password <secret> Replace <secret> with your actual Redis password. This action will re-enable the Redis, and it will now run with the specified redis user and redis group. NOTE: Following a CVX server reload or power cycle, all previously mentioned steps must be repeated.

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126
vendor-advisory
Hyperlink: https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126
Resource:
vendor-advisory
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:psirt@arista.com
Published At:05 Jun, 2026 | 17:16
Updated At:05 Jun, 2026 | 19:03

An authenticated Redis session could be used to obtain full root access to all servers in the CVX cluster. Note that this would require an attacker to have both network access to the Redis service on a CVX server and the Redis password. Please note that all Redis communication, including authentication, occurs over plaintext in the present day. TLS support is tracked under RFE1294850.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.18.3HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 8.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-269Secondarypsirt@arista.com
CWE ID: CWE-269
Type: Secondary
Source: psirt@arista.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126psirt@arista.com
N/A
Hyperlink: https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126
Source: psirt@arista.com
Resource: N/A

Change History

0
Information is not available yet

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