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Fencer Intel
medium 5.4

CVE-2021-31583 json

Sipwise C5 NGCP WWW Admin version 3.6.7 up to and including platform version NGCP CE 3.0 has multiple authenticated stored and reflected XS…

published 5y ago modified 4mo ago also EUVD-2021-18477

cvss
5.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

Sipwise C5 NGCP WWW Admin version 3.6.7 up to and including platform version NGCP CE 3.0 has multiple authenticated stored and reflected XSS vulnerabilities when input passed via several parameters to several scripts is not properly sanitized before being returned to the user: Stored XSS in callforward/time/set/save (POST tsetname); Reflected XSS in addressbook (GET filter); Stored XSS in addressbook/save (POST firstname, lastname, company); and Reflected XSS in statistics/versions (GET lang).

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Exploit prediction

1.12% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/162316/Sipwise-C5-NGCP-CSC-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified
  • zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5648.php referenced PoC, tagged "exploit" by a source, unverified
  • lists.sipwise.com http://lists.sipwise.com/pipermail/spce-user_lists.sipwise.com/2021-September/014708.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
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 Intel 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.