CVE-2019-9183Public exploitNetwork attack vector

Remote crash via truncated 6LoWPAN fragment

Published Apr 23, 2020 · Updated Aug 4, 2024

Buffer overflow in Contiki-NG through 4.3 and Contiki through 3.0 allows remote attackers to crash devices via a crafted 6LoWPAN frame. In os/net/ipv6/sicslowpan.c, truncated fragment data underflows a length calculation, causing fragment processing to write beyond the valid buffer into unmapped memory. No authentication or user interaction is required; receiving the malformed frame interrupts service without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Contiki-NG through 4.3 and Contiki through 3.0 allows remote attackers to crash devices via a crafted 6LoWPAN frame. In os/net/ipv6/sicslowpan.c, truncated fragment data underflows a length calculation, causing fragment processing to write beyond the valid buffer into unmapped memory. No authentication or user interaction is required; receiving the malformed frame interrupts service without reported data disclosure or modification.

The record

CVE
CVE-2019-9183
Published
Apr 23, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-191, CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2020CVE 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.

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 exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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