CVE-2026-20282
MEDIUMDescription
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials. Note: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.
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:H/UI:N/S:U/C:N/I:H/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 45% of all known CVEs.
References
Related Vulnerabilities
Other CWE-641 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-41146 | High | 8.8 | 1.5% | - | Fix |
| CVE-2026-25177 | High | 8.8 | 1.3% | - | Fix |
| CVE-2024-30063 | Medium | 6.7 | 1.0% | - | Fix |
| CVE-2023-0046 | High | 7.2 | 1.0% | - | Fix |
| CVE-2022-23536 | Medium | 6.5 | 0.8% | - | - |
| CVE-2025-21361 | High | 7.8 | 0.7% | - | Fix |
Common questions
How do I fix CVE-2026-20282?
No published fix for CVE-2026-20282 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-20282 being actively exploited?
Not that we know of. CVE-2026-20282 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.56% is the estimated probability that it will be exploited in the next 30 days. That is higher than 45% of all scored CVEs.
How severe is CVE-2026-20282?
CVE-2026-20282 has a CVSS v3 base score of 4.9, rated medium. 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 2026-09-18.