CVE-2021-1230
HIGHEPSS 72th pctlDescription
A vulnerability with the Border Gateway Protocol (BGP) for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a routing process to crash, which could lead to a denial of service (DoS) condition. This vulnerability is due to an issue with the installation of routes upon receipt of a BGP update. An attacker could exploit this vulnerability by sending a crafted BGP update to an affected device. A successful exploit could allow the attacker to cause the routing process to crash, which could cause the device to reload. This vulnerability applies to both Internal BGP (IBGP) and External BGP (EBGP). Note: The Cisco implementation of BGP accepts incoming BGP traffic from explicitly configured peers only. To exploit this vulnerability, an attacker would need to send a specific BGP update message over an established TCP connection that appears to come from a trusted BGP peer.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploit Intelligence
Elevated risk: more likely to be exploited than 72% of all known CVEs.
References
Related Vulnerabilities
Other CWE-233 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-52970 | High | 8.1 | 9.8% | - | Fix |
| CVE-2023-20076 | High | 7.2 | 1.5% | - | Fix |
| CVE-2024-24525 | Critical | 9.8 | 1.1% | - | - |
| CVE-2022-45182 | Critical | 9.8 | 0.9% | - | Fix |
| CVE-2024-31808 | High | 8.8 | 0.9% | - | - |
| CVE-2021-0269 | High | 8.8 | 0.9% | - | - |
Common questions
How do I fix CVE-2021-1230?
No published fix for CVE-2021-1230 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2021-1230 being actively exploited?
Not that we know of. CVE-2021-1230 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 72% of all scored CVEs.
How severe is CVE-2021-1230?
CVE-2021-1230 has a CVSS v3 base score of 8.6, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.