This vulnerability allows remote attackers to execute arbitrary code on affected installations of SolarWinds Network Performance Monitor 20…

published 2021-05-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18374

cvss: 9.8; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 93.9%; EPSS 93.9% chance of exploitation in 30 days, percentile 99.8%
public exploits: 0; none known

This vulnerability allows remote attackers to execute arbitrary code on affected installations of SolarWinds Network Performance Monitor 2020.2.1. Authentication is not required to exploit this vulnerability. The specific flaw exists within the SolarWinds.Serialization library. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of SYSTEM. Was ZDI-CAN-12213.

Patch / fix

fixed in 1

solarwinds network_performance_monitor 2020.2.5

Exploit prediction

93.94% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

SolarWinds Network Performance Monitor

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

References

documentation.solarwinds.com /en/success_center/sam/content/release_notes/sam_2020-2-5_release_notes.htm
release-notes, vendor-advisory
zerodayinitiative.com /advisories/ZDI-21-602/
third-party-advisory, vdb-entry

Sources

CVE List CVE-2021-31474
NVD CVE-2021-31474

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary