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Fencer Vulns
medium 5.4

CVE-2021-30119 in the critical feed json

Authenticated Authenticated reflective XSS in Kaseya VSA <= v9.5.6

published 2021-07-09 5 y ago modified 2026-08-14 2 mo ago also EUVD-2021-17059

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
58.8%
EPSS 58.8% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known

Summary

Authenticated reflective XSS in HelpDeskTab/rcResults.asp The parameter result of /HelpDeskTab/rcResults.asp is insecurely returned in the requested web page and can be used to perform a Cross Site Scripting attack Example request: `https://x.x.x.x/HelpDeskTab/rcResults.asp?result=<script>alert(document.cookie)</script>` The same is true for the parameter FileName of /done.asp Eaxmple request: `https://x.x.x.x/done.asp?FileName=";</script><script>alert(1);a="&PathData=&originalName=shell.aspx&FileSize=4388&TimeElapsed=00:00:00.078`

Patch / fix

  • kaseya vsa 9.5.7

Timeline

  1. CISA SSVC: exploitation active
  2. Published

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
5 y ago

Exploit prediction

58.76% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • csirt.divd.nl https://csirt.divd.nl/CVE-2021-30119 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

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.