CVE-2021-27753

Local file overwrite via Android path traversal

Published Feb 21, 2022 · Updated Aug 3, 2024

Path traversal in HCL Sametime Android 11.6.4 and earlier allows local users to overwrite files through crafted File-class path input. The vulnerable File handling accepts traversal components instead of constraining paths to the intended application directory, allowing a low-privilege user on the device to alter files within reachable storage. The documented impact is integrity loss without confidentiality or availability effects, and exploitation requires local access to the Android client.

CVSS severity5.5
Medium
EPSS probability0.25%
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 HCL Sametime Android 11.6.4 and earlier allows local users to overwrite files through crafted File-class path input. The vulnerable File handling accepts traversal components instead of constraining paths to the intended application directory, allowing a low-privilege user on the device to alter files within reachable storage. The documented impact is integrity loss without confidentiality or availability effects, and exploitation requires local access to the Android client.

The record

CVE
CVE-2021-27753
Published
Feb 21, 2022
Updated
Aug 3, 2024
Vendor
HCLSoftware
Product
HCL Sametime
Classifications
CWE-22, T1420
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 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="HCL Sametime 11.6.4 and below"

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

HCLSoftware · HCL Sametimeversion="HCL Sametime 11.6.4 and below"

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.1NVDAV:L/AC:L/Au:N/C:N/I:P/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1420Path and Directory Discovery

Public exploit references

No public exploit references are available in this record.

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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