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Actively exploited vulnerability

Treck TCP/IP stack IPv6: information disclosure flaw under attack

CVE-2020-11899 · Treck TCP/IP stack Out-of-Bounds Read Vulnerability

Business software5.4 medium

What is affected

Treck TCP/IP stack IPv6 is mostly run by companies, schools and public bodies, not on home computers. You are unlikely to have it yourself, but organisations that hold your data may. Breaches that start with flaws like this one are how personal data ends up leaked.

The Treck TCP/IP stack contains an IPv6 out-of-bounds read vulnerability.

CISA's description

What an attacker can do

This is a information disclosure flaw. It lets an attacker read data they are not supposed to see, such as memory contents, credentials or internal files. It is often the first step of a larger attack.

How it is reached
From the same local network
Access the attacker needs
No account needed
Does the victim have to do something?
No, works without the victim doing anything

What to do

  1. At home: nothing to install. Keep your own devices updated and use a different password for every service, so that a breach at one organisation does not open your other accounts.
  2. If you administer Treck TCP/IP stack IPv6 at work: apply the vendor's fix or mitigation now and review logs for signs of compromise, because the flaw was being exploited before it was listed.
  3. If the product is past its support date and no fix exists, take it off the internet or retire it.

Apply updates per vendor instructions.

Action required by CISA for US federal agencies

How urgent is it

CISA added this vulnerability to its Known Exploited Vulnerabilities catalogue on March 3, 2022, which means there is reliable evidence of attacks in the wild. US federal agencies must fix it by March 17, 2022, a deadline that has already passed. That deadline does not bind anyone else, but it shows how seriously the agency rates it.

The EPSS model estimates a 18% probability that this flaw will be exploited somewhere in the next 30 days. That is higher than 97% of all scored vulnerabilities.

Its CVSS severity score is 5.4 out of 10 (medium), as recorded in the US National Vulnerability Database.

Technical description

The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.

NIST National Vulnerability Database
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