THREATPORT/VULNERABILITY/CVE-2021-33959
HIGH SEVERITY

CVE-2021-33959

Media Server vulnerability

CVSS
7.5
EPSS
15.0%
EPSS pct
96th
Exploited
No known
Plex media server 1.21 and before is vulnerable to ddos reflection attack via plex service.
Affected vendor
Plex
Affected product
Media Server
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-346 — Origin Validation Error
Published
2023-01-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 15.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-33959

  • Confirm whether Plex Media Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-33959.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-33959

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-33959 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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Are you exposed to CVE-2021-33959?

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