utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, becaus

Affected versions

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

• arista eosup to 4.20.15 inclusive
• arista eos4.23 and later · up to 4.23.3m inclusive
• arista eos4.22 and later · up to 4.22.4m inclusive
• arista eos4.21.0 and later · up to 4.21.10m inclusive
• arista eos4.24.0f
• debian debian linux8.0
• debian debian linux9.0
• fedoraproject fedora30
• fedoraproject fedora31
• fedoraproject fedora32
• juniper junos12.3
• juniper junos12.3r12
• juniper junos12.3x48
• juniper junos12.3x50
• juniper junos15.1
• juniper junos15.1x49
• juniper junos15.1x49-d140
• juniper junos15.1x49-d150
• juniper junos15.1x49-d160
• juniper junos15.1x49-d30

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

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

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

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

1char buf[256];2memcpy(buf, pkt->data, pkt->len);

1char buf[256];2if (pkt->len > sizeof(buf)) {3  return -EINVAL;4}5memcpy(buf, pkt->data, pkt->len);

Attack context

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