Insecure Deserialization of untrusted data causing Remote code execution vulnerability.

published 2021-09-08 5y ago modified 2026-06-17 4mo ago also EUVD-2021-21860

cvss: 8.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 72.8%; EPSS 72.8% chance of exploitation in 30 days, percentile 99.4%
public exploits: 0; none known

Insecure Deseralization of untrusted data remote code execution vulnerability was discovered in Patch Manager Orion Platform Integration module and reported to us by ZDI. An Authenticated Attacker could exploit it by executing WSAsyncExecuteTasks deserialization of untrusted data.

Patch / fix

fixed in 1

SolarWinds Orion Platform 2020.2.6

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Exploit prediction

72.79% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.9	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

SolarWinds Orion Platform

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

References

documentation.solarwinds.com /en/success_center/orionplatform/content/core-secure-configuration.htm
vendor-advisory
documentation.solarwinds.com /en/success_center/orionplatform/content/release_notes/orion_platform_2020-2-6_release_notes.htm
release-notes, vendor-advisory
solarwinds.com /trust-center/security-advisories/cve-2021-35217
vendor-advisory
zerodayinitiative.com /advisories/ZDI-21-1247/
third-party-advisory, vdb-entry

Sources

CVE List CVE-2021-35217
NVD CVE-2021-35217

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