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CVE record · CVE-2021-31355

Junos OS: Stored Cross-Site Scripting (XSS) vulnerability in captive portal

CVSS 8.0 HighEPSS 0.0081 · 57th percentile

Published by the CVE Program (CNA: juniper) at 19 Oct 2021, 18:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Juniper Networks Junos OS
  • affected 12.3X48 to before 12.3X48-D105 custom
  • affected 15.1X49 to before 15.1X49-D220 custom
  • affected 18.3 to before 18.3R3-S5 custom
  • affected 18.4 to before 18.4R3-S9 custom
  • affected 19.1 to before 19.1R3-S7 custom
  • affected 19.2 to before 19.2R3-S3 custom
  • affected 19.3 to before 19.3R3-S4 custom
  • affected 19.4 to before 19.4R3-S6 custom
  • affected 20.1 to before 20.1R3 custom
  • affected 20.2 to before 20.2R1-S1, 20.2R2 custom
  • affected 20.3 to before 20.3R2 custom
  • affected 20.4 to before 20.4R2 custom
  • and 1 more
Identifiers
CVE-2021-31355
CNA
juniper
Weakness (CWE)
CWE-79
Tags
Published
19 Oct 2021
Updated
17 Sept 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.0 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H CNA (juniper)
  • CISA KEV Not listed.
  • EPSS 0.0081, the 57th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 19 Oct 2021. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.