CVE-2020-10188
Published · Updated
25Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 74%
exploitation probability
74%top 1% of all CVEs
observed exploitation
nono source reports it
What the vendors declare (VEX)
Official vendor statements in CSAF/VEX format: whether their product is affected, already fixed, or ruled out — and why. These are the vendor's assertions, not Vexday's judgment.
Red HatVEX document ↗
Affected
1 product
Red Hat Enterprise Linux 5
workaround: When in enforcing mode, SELinux as configured in Red Hat Enterprise Linux provides some mitigation against an exploit for telnet-server, because it limits the kind of operations it can perform and programs that can be run from the telnet-server's…
Fixed
16 products (75 components)
Red Hat Enterprise Linux Server (v. 6) · Red Hat Enterprise Linux Server E4S (v. 7.6) · Red Hat Enterprise Linux Server E4S (v. 7.7) · Red Hat Enterprise Linux Desktop (v. 6) · Red Hat Enterprise Linux Workstation (v. 6) · and others 11
Not affected
10 products (74 components) — because the vulnerable code is not present in the product
Red Hat Enterprise Linux AppStream (v. 8) · Red Hat Enterprise Linux Server (v. 6) · Red Hat Enterprise Linux AppStream E4S (v. 8.0) · Red Hat Enterprise Linux Desktop (v. 6) · Red Hat Enterprise Linux Server (v. 7) · and others 5
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.
Affected products
n/a · n/aReferences
https://appgateresearch.blogspot.com/2020/02/bravestarr-fedora-31-netkit-telnetd_28.htmlhttps://github.com/krb5/krb5-appl/blob/d00cd671dfe945791b33d4f1f6a5c57ae1667ef8/telnet/telnetd/utility.c#L205-L216https://lists.debian.org/debian-lts-announce/2020/05/msg00012.htmlhttps://lists.debian.org/debian-lts-announce/2020/08/msg00038.htmlhttps://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-EFJrEzPxhttps://www.arista.com/en/support/advisories-notices/security-advisories/10702-security-advisory-48https://www.oracle.com/security-alerts/cpuApr2021.htmlhttp://www.openwall.com/lists/oss-security/2026/01/20/8