CVE-2026-73453Security Advisory 0174
- 9.5CriticalCVSS base score
- 0.69%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. P4Runtime is disabled by default in Arista EOS. By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Timeline
ID reserved
By Arista
- 35 days later
· 35 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| AristaCNA (assigner) | 4.0 | Critical9.5 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| AristaCNA (assigner) | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Awaiting Analysis | 4.0 | Critical9.5 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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 |
- EPSS (exploitation in 30 days)
- 0.69% · top 46% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.5.
Affected products
- affected 4.36.0F – ≤ 4.36.1F
- affected 4.35.0F – ≤ 4.35.5M
- affected 4.34.0F – ≤ 4.34.7M
- affected 4.33.0F – < 4.34.0F
- affected 4.32.0F – < 4.33.0F
- affected 4.31.0F – < 4.32.0F
- affected 4.30.0F – < 4.31.0F
- affected 4.29.2F – < 4.30.0F
What to do
Solution: 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. CVE-2026-73453 has been fixed in the following releases: - 4.36.2F and later releases in the 4.36.x train - 4.35.6M and later releases in the 4.35.x train - 4.34.8M and later releases in the 4.34.x train No hotfix is available for this issue.
Workaround: To mitigate this issue, it is recommended to configure the p4-runtime service in mTLS mode (ssl profile with trust certificates). Additionally, enable gNSI Authz to facilitate RPC authorization via the client certificate SPIFFE-ID. Please note that enabling mTLS config will terminate all existing P4 client connections and may cause control plane disruption since packet I/O operations are impacted. Before implementing this solution, the following pre-requisites must be met: 1. Generate SPIFFE-ID client certificate signed by the server trusted CA and use it for establishing P4 client connection to the server. 2. Define a json file with SPIFFE-ID based policies for Authz service and install it on the device using gNSI Authz.Rotate() rpc. switch>show running-config section p4-runtime p4-runtime no shutdown ! transport grpc foo ssl profile campus authentication username priority x509-spiffe switch>show running-config section security management security ssl profile campus certificate server.crt key server.key trust certificate ca.crt switch>show running-config section gnsi management api gnsi service authz
References
References1
- Security Advisory 0174 (opens in a new tab)vendor-advisory
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-80588 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-73453)Record last updated .