CVE-2020-10188

utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions.

• CWE-120

• https://appgateresearch.blogspot.com/2020/02/bravestarr-fedora-31-netkit-telnetd_28.htmlThird Party Advisory
• https://github.com/krb5/krb5-appl/blob/d00cd671dfe945791b33d4f1f6a5c57ae1667ef8/telnet/telnetd/utility.c#L205-L216Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/05/msg00012.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/08/msg00038.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7FMTRRQTYKWZD2GMXX3GLZV46OLPCLVK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLU6FL24BSQQEB2SJC26NLJ2MANQDA7M/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3VJ6V2Z3JRNJOBVHSOPMAC76PSSKG6A/
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-telnetd-EFJrEzPxThird Party Advisory
• https://www.arista.com/en/support/advisories-notices/security-advisories/10702-security-advisory-48Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/01/20/8
• https://appgateresearch.blogspot.com/2020/02/bravestarr-fedora-31-netkit-telnetd_28.htmlThird Party Advisory
• https://github.com/krb5/krb5-appl/blob/d00cd671dfe945791b33d4f1f6a5c57ae1667ef8/telnet/telnetd/utility.c#L205-L216Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/05/msg00012.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/08/msg00038.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7FMTRRQTYKWZD2GMXX3GLZV46OLPCLVK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLU6FL24BSQQEB2SJC26NLJ2MANQDA7M/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3VJ6V2Z3JRNJOBVHSOPMAC76PSSKG6A/
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-telnetd-EFJrEzPxThird Party Advisory
• https://www.arista.com/en/support/advisories-notices/security-advisories/10702-security-advisory-48Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory

Published

Mar 6, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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