CVE-2020-24113Public exploitNetwork attack vector

Sensitive file disclosure via filename path traversal

Published Aug 22, 2023 · Updated Oct 3, 2024

Path traversal in the Yealink W60B 77.83.0.85 and earlier contact-file upload interface allows remote attackers to read sensitive files. The load action accepts traversal paths in its filename query parameter, allowing requests for device files such as /etc/shadow. No authentication or user interaction is required; crafted requests can expose device files, while some file selections can interrupt service.

CVSS severity9.1
Critical
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in the Yealink W60B 77.83.0.85 and earlier contact-file upload interface allows remote attackers to read sensitive files. The load action accepts traversal paths in its filename query parameter, allowing requests for device files such as /etc/shadow. No authentication or user interaction is required; crafted requests can expose device files, while some file selections can interrupt service.

The record

CVE
CVE-2020-24113
Published
Aug 22, 2023
Updated
Oct 3, 2024
Vendor
Yealink
Product
W60B
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=77.83.0.85

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Yealink · W60Bversion=77.83.0.85

Published CVSS scores

9.8YealinkCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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