5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 Medium
AI Score
Confidence
High
0.0005 Low
EPSS
Percentile
17.0%
Contiki-NG is an operating system for internet-of-things devices. In versions 4.9 and prior, when a packet is received, the Contiki-NG network stack attempts to start the periodic TCP timer if it is a TCP packet with the SYN flag set. But the implementation does not first verify that a full TCP header has been received. Specifically, the implementation attempts to access the flags field from the TCP buffer in the following conditional expression in the check_for_tcp_syn
function. For this reason, an attacker can inject a truncated TCP packet, which will lead to an out-of-bound read from the packet buffer. As of time of publication, a patched version is not available. As a workaround, one can apply the changes in Contiki-NG pull request #2510 to patch the system.
Vendor | Product | Version | CPE |
---|---|---|---|
contiki\-ng | contiki\-ng\. | * | cpe:2.3:o:contiki\-ng:contiki\-ng\.:*:*:*:*:*:*:*:* |
[
{
"vendor": "contiki-ng",
"product": "contiki-ng",
"versions": [
{
"version": "<= 4.9",
"status": "affected"
}
]
}
]
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 Medium
AI Score
Confidence
High
0.0005 Low
EPSS
Percentile
17.0%