CVE-2021-31156

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.95% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 58.9% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2024-03-28 00:00Z2 YR AGO

Last updated

2025-04-08 20:49Z1 YR AGO

Reserved

2021-04-14

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base

Data version

5.1

Document digest

76fe57a3a5fa5ea0c8612ad67f0289a073207a8afb9c4c32917e41f883c6ebfc

• www.alliedtelesis.comhttps://www.alliedtelesis.com/en/documents/software-release-notes-s115-v120
• www.alliedtelesis.comhttps://www.alliedtelesis.com/sites/default/files/documents/release-notes/ats115v120srna.pdf
• gist.github.comhttps://gist.github.com/NitescuLucian/69cf22d17bf190325118304be04828e8