VDB-344383 · CVE-2026-25139 · GHSA-c8fh-23qr-97mc

RIOT-OS RIOT up to 2025.10 sixlowpan_sfr_rfrag_t out-of-bounds

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.5	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in RIOT-OS RIOT up to 2025.10. The affected element is the function sixlowpan_sfr_rfrag_t. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2026-25139. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in RIOT-OS RIOT up to 2025.10. It has been declared as critical. Affected by this vulnerability is the function sixlowpan_sfr_rfrag_t. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, and availability. The summary by CVE is:

RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In version 2025.10 and prior, multiple out-of-bounds read allow any unauthenticated user, with ability to send or manipulate input packets, to read adjacent memory locations, or crash a vulnerable device running the 6LoWPAN stack. The received packet is cast into a sixlowpan_sfr_rfrag_t struct and dereferenced without validating the packet is large enough to contain the struct object. At time of publication, no known patch exists.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-25139 since 01/29/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/20/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

RIOT-OS

Name

RIOT

Version

Website

Product: https://github.com/RIOT-OS/RIOT/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.5

VulDB Base Score: 8.2
VulDB Temp Score: 7.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.1
NVD Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/29/2026 CVE reserved
02/04/2026 +6 days Advisory disclosed
02/04/2026 +0 days VulDB entry created
02/20/2026 +16 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-c8fh-23qr-97mc
Status: Not defined

CVE: CVE-2026-25139 (🔒)
GCVE (CVE): GCVE-0-2026-25139
GCVE (VulDB): GCVE-100-344383

Entryinfo

Created: 02/04/2026 20:01
Updated: 02/20/2026 18:31
Changes: 02/04/2026 20:01 (66), 02/20/2026 18:31 (12)
Complete: 🔍
Cache ID: 216::103