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CVE-2024-41126· NVD / CVE Program· CNA GitHub_M

Out-of-bounds read when decoding SNMP messages in Contiki-NG

Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-message.c module, where the snmp_message_decode function fails to check the boundary of the message buffer when reading a byte from it immediately after decoding an object identifier (OID). The problem has been patched in Contiki-NG pull request 2937. It will be included in the next release of Contiki-NG. Users are advised to either apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.

CriticalCVSS 9.6 · v3.1—No exploit No fix recorded
Published
Nov 27, 2024
Updated
Jun 17, 2026
EPSS
0.3% · 20th percentile
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Report tools

JSON

Action score

38

Monitor

Low priority for now.

CVSS
38 / 40 · 9.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.6
CNA · GitHub_M
8.4
1.2 point gap

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
contiki-ngcontiki-ng

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • contiki-ng contiki-ngup to 4.9 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • contiki-ng contiki-ng

    • <= 4.9affected

Same product

contiki-ng: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-24336An issue was discovered in Contiki through 3.0 and Contiki-NG through 4.5.
    57Plan
  • CVE-2018-19417An issue was discovered in the MQTT server in Contiki-NG before 4.2.
    42Plan
  • CVE-2018-1000804contiki-ng version 4 contains a Buffer Overflow vulnerability in AQL (Antelope Query Language) database engine that can result in Attacker c
    41Plan
  • CVE-2022-35927Unverified DIO prefix info lengths in RPL-Classic in Contiki-NG
    40Plan
  • CVE-2020-14935Buffer overflows were discovered in Contiki-NG 4.4 through 4.5, in the SNMP bulk get request response encoding function.
    40Plan
  • CVE-2019-8359An issue was discovered in Contiki-NG through 4.3 and Contiki through 3.0.
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-411250 days apartOut-of-bounds read in SNMP when decoding a string in Contiki-NG
    38Monitor
  • CVE-2023-34101532 days apartContiki-NG vulnerable to out-of-bounds read when processing ICMP DAO input
    36Monitor
  • CVE-2023-50926287 days apartUnvalidated DIO prefix info length in RPL-Lite in Contiki-NG
    30Monitor
  • CVE-2023-50927287 days apartInsufficient boundary checks for DIO and DAO messages in RPL-Lite in Contiki-NG
    30Monitor
  • CVE-2023-34100537 days apartOut-of-Bounds Read in contiki-ng
    26Monitor
  • CVE-2023-37281439 days apartOut-of-bounds read during IPHC address decompression
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records