An issue was discovered in Contiki Operating System 3.0.

Affected versions

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

• contiki-os contiki3.0

Other highest-scoring records for the same primary product.

• CVE-2020-13986An issue was discovered in Contiki through 3.0.
  31Monitor
• CVE-2020-13985An issue was discovered in Contiki through 3.0.
  31Monitor
• CVE-2020-13984An issue was discovered in Contiki through 3.0.
  31Monitor
• CVE-2021-40523In Contiki 3.0, Telnet option negotiation is mishandled.
  30Monitor
• CVE-2021-38387In Contiki 3.0, a Telnet server that silently quits (before disconnection with clients) leads to connected clients entering an infinite loop
  30Monitor
• CVE-2021-38386In Contiki 3.0, a buffer overflow in the Telnet service allows remote attackers to cause a denial of service because the ls command is misha
  30Monitor

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

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.