CVE-2021-41849Network attack vector

PII disclosure via unencrypted background HTTP uploads

Published Mar 11, 2022 · Updated Aug 4, 2024

Cleartext transmission in Luna Simo PPR1.180610.011/202001031830 allows attackers to read device IMEI and installed-app data via HTTP interception. The preinstalled /system/bin/osi_bin process posts a gzip-compressed plaintext log containing the IMEI and application list to log.skyroam.com.cn about every five hours. Man-in-the-middle attackers able to observe the device's network traffic can recover the data even when the Simo service is not in use.

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

Cleartext transmission in Luna Simo PPR1.180610.011/202001031830 allows attackers to read device IMEI and installed-app data via HTTP interception. The preinstalled /system/bin/osi_bin process posts a gzip-compressed plaintext log containing the IMEI and application list to log.skyroam.com.cn about every five hours. Man-in-the-middle attackers able to observe the device's network traffic can recover the data even when the Simo service is not in use.

The record

CVE
CVE-2021-41849
Published
Mar 11, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-319, CWE-200, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1040Network Sniffing

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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