CVE-2020-11145Network attack vector

Remote service interruption via sequence-number validation

Published Jan 21, 2021 · Updated Aug 4, 2024

Denial of service in Qualcomm Snapdragon data modem firmware allows remote attackers to interrupt service via malformed sequence numbers. The delta-extension-header update path improperly validates the master and extension-header sequence numbers before an arithmetic operation, permitting a zero divisor. An unauthenticated network path to the modem input is sufficient, and the divide-by-zero interrupts availability without disclosed data access or modification.

CVSS severity7.5
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Qualcomm Snapdragon data modem firmware allows remote attackers to interrupt service via malformed sequence numbers. The delta-extension-header update path improperly validates the master and extension-header sequence numbers before an arithmetic operation, permitting a zero divisor. An unauthenticated network path to the modem input is sufficient, and the divide-by-zero interrupts availability without disclosed data access or modification.

The record

CVE
CVE-2020-11145
Published
Jan 21, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-369, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 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

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 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-369Divide By Zero
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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