CVE-2021-28510
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
For certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with an invalid Type-Length-Value (TLV) causes the PTP agent to restart. Repeated restarts of the service will make the service unavailable.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Arista Networks | EOS | 4.22 | affected |
| Arista Networks | EOS | 4.27.1 <= 4.27.0 | affected |
| Arista Networks | EOS | 4.26.4 <= 4.26.0 | affected |
| Arista Networks | EOS | 4.25.6 <= 4.25.0 | affected |
| Arista Networks | EOS | 4.24.8 <= 4.24.0 | affected |
| Arista Networks | EOS | 4.23.10 <= 4.23.0 | affected |
Weaknesses
- CWE-400: CWE-400 Uncontrolled Resource Consumption
Workarounds
Install ACL rules to drop PTP packets from untrusted sources. Best practice is to block access to untrusted (non-management) networks.
ADP Enrichment
CVE Program Container
Additional References
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
References
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.