CVE-2023-24509: On affected modular platforms running Arista EOS equipped with both redundant supervisor modules and having th

Q: How do I fix CVE-2023-24509?

eos: upgrade to 4.24.11m, 4.25.10m, 4.26.9m, 4.27.7m, 4.28.4m. Exact commands for each OS are on this page.

Q: Is CVE-2023-24509 being exploited?

CVE-2023-24509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-24509 affect?

CVE-2023-24509 affects eos. Severity is critical (CVSS 9.3). On affected modular platforms running Arista EOS equipped with both redundant supervisor modules and having the redundancy protocol configured with RPR or SSO, an existing unprivileged user can login to the standby supervisor as a root user

Q: How urgent is CVE-2023-24509?

Priority 41/100. Critical severity; Public exploit reference

This month

CRITICAL 9.3UPGRADE

CVE-2023-24509 is a critical-severity flaw (CVSS 9.3) affecting eos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

On affected modular platforms running Arista EOS equipped with both redundant supervisor modules and having the redundancy protocol configured with RPR or SSO, an existing unprivileged user can login to the standby supervisor as a root user, leading to a privilege escalation. Valid user credentials are required in order to exploit this vulnerability.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-269
Published	2023-04-13
Last modified	2026-06-17

Publisher (CNA): Arista Networks, Inc. · Vendor: arista

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-13 20:15 UTCPublished CVE record published
2026-06-17 05:39 UTCUpdated Record last modified

arista eos UPGRADE

Affected: >= 4.23 and <= 4.23.13m · >= 4.24.0 and < 4.24.11m · >= 4.25.0 and < 4.25.10m · >= 4.26.0 and < 4.26.9m · >= 4.27.0 and < 4.27.7m · >= 4.28.0 and < 4.28.4m

Fixed in: 4.24.11m, 4.25.10m, 4.26.9m, 4.27.7m, 4.28.4m

Safe to downgrade to: a release before 4.23

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-24509?

eos: upgrade to 4.24.11m, 4.25.10m, 4.26.9m, 4.27.7m, 4.28.4m. Exact commands for each OS are on this page.

Is CVE-2023-24509 being exploited?

CVE-2023-24509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-24509 affect?

CVE-2023-24509 affects eos. Severity is critical (CVSS 9.3). On affected modular platforms running Arista EOS equipped with both redundant supervisor modules and having the redundancy protocol configured with RPR or SSO, an existing unprivileged user can login to the standby supervisor as a root user

How urgent is CVE-2023-24509?

Priority 41/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-7473 MEDIUM 5.8 EXPLOITED MITIGATE Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
CVE-2024-6387 HIGH 8.1 MITIGATE MITIGATE A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd)
CVE-2023-24512 HIGH 8.8 UPGRADE MITIGATE On affected platforms running Arista EOS, an authorized attacker with permissions to perform gNMI requests cou
CVE-2023-24511 MEDIUM 5.3 UPGRADE On affected platforms running Arista EOS with SNMP configured, a specially crafted packet can cause a memory l
CVE-2023-24510 HIGH 7.5 UPGRADE On the affected platforms running EOS, a malformed DHCP packet might cause the DHCP relay agent to restart.

References

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