SolarWinds Orion Authentication Bypass Vulnerability
The SolarWinds Orion API is vulnerable to an authentication bypass that could allow a remote attacker to execute API commands. This vulnerability could allow a remote attacker to bypass authentication and execute API commands which may…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)03 Nov 2021
- Exploited in EUVD (ENISA)03 Nov 2021
- Used by ransomwareno
- EPSS above 10 %92.0%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
The SolarWinds Orion API is vulnerable to an authentication bypass that could allow a remote attacker to execute API commands. This vulnerability could allow a remote attacker to bypass authentication and execute API commands which may result in a compromise of the SolarWinds instance. SolarWinds Orion Platform versions 2019.4 HF 5, 2020.2 with no hotfix installed, and 2020.2 HF 1 are affected.
Affected products
- 2019.4 HF 5
- 2020.2 HF 1
- 2020.2 without hotfix
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 92.0%
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-28318SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability6.7 · Actively exploited
- CVE-2025-26399SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability9.6 · Background exploitation
- CVE-2025-40536SolarWinds Web Help Desk Security Control Bypass Vulnerability7.8 · Background exploitation
- CVE-2025-40551SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability8.8 · Background exploitation
- CVE-2024-28987SolarWinds Web Help Desk Hardcoded Credential Vulnerability8.8 · Background exploitation
- CVE-2024-28986SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability8.9 · Background exploitation