CVE-2020-11166Network attack vector

Memory disclosure and modem interruption via ROHC padding

Published Mar 17, 2021 · Updated Aug 4, 2024

Buffer over-read in Qualcomm Snapdragon Data Modem allows remote attackers to disclose memory and interrupt service via a malformed ROHC header. The modem's ROHC parser advances through an unusually large run of leading padding octets without a sufficient bounds check, reading past the header buffer. Remote attackers need no privileges or user interaction but must deliver the crafted compressed header to an affected user device.

CVSS severity8.2
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in Qualcomm Snapdragon Data Modem allows remote attackers to disclose memory and interrupt service via a malformed ROHC header. The modem's ROHC parser advances through an unusually large run of leading padding octets without a sufficient bounds check, reading past the header buffer. Remote attackers need no privileges or user interaction but must deliver the crafted compressed header to an affected user device.

The record

CVE
CVE-2020-11166
Published
Mar 17, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-126, CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 17, 2021CVE 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

6.4NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:N/A:P
8.2Qualcomm Technologies, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
9.1NIST National Vulnerability DatabaseCVSS: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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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