CVE-2001-0554

Exp

Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows remote attackers to execute arbitrary commands via a set of options including AYT (Are You There), which is not properly handled by the telrcv function.

Published: 2001-08-14 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2001-0554 is rated High Exploit Risk (83.1/100): CVSS Critical severity, with high exploitation likelihood (EPSS 16.67%, 95th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2001-0554

EDB-ID Source Kind Published Link
21018 exploit_db edb 2001-07-18 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2001-0554

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-27 27.44% 16.67% -10.76%
2 2025-03-30 46.25% 27.44% -18.81%
3 2025-03-29 — 46.25% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2001-0554

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2001-0554

OS Trackers for CVE-2001-0554

vendor priority summary link
gentoo high CVE-2001-0554: 1 GLSA(s) (200410-03), 1 atom(s) (net-misc/netkit-telnetd); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2001-0554
redhat critical — https://access.redhat.com/security/cve/CVE-2001-0554
suse medium — https://www.suse.com/security/cve/CVE-2001-0554/

Affected software / configurations for CVE-2001-0554

Vendor Product Version Raw CPE
mit kerberos 1.0 cpe:2.3:a:mit:kerberos:1.0:*:*:*:*:*:*:*
mit kerberos_5 1.1 cpe:2.3:a:mit:kerberos_5:1.1:*:*:*:*:*:*:*
mit kerberos_5 1.1.1 cpe:2.3:a:mit:kerberos_5:1.1.1:*:*:*:*:*:*:*
mit kerberos_5 1.2 cpe:2.3:a:mit:kerberos_5:1.2:*:*:*:*:*:*:*
mit kerberos_5 1.2.1 cpe:2.3:a:mit:kerberos_5:1.2.1:*:*:*:*:*:*:*
mit kerberos_5 1.2.2 cpe:2.3:a:mit:kerberos_5:1.2.2:*:*:*:*:*:*:*
netkit linux_netkit 0.10 cpe:2.3:a:netkit:linux_netkit:0.10:*:*:*:*:*:*:*
netkit linux_netkit 0.11 cpe:2.3:a:netkit:linux_netkit:0.11:*:*:*:*:*:*:*
netkit linux_netkit 0.12 cpe:2.3:a:netkit:linux_netkit:0.12:*:*:*:*:*:*:*
sgi irix 6.5 cpe:2.3:o:sgi:irix:6.5:*:*:*:*:*:*:*
freebsd freebsd 2.0 cpe:2.3:o:freebsd:freebsd:2.0:*:*:*:*:*:*:*
freebsd freebsd 2.0.1 cpe:2.3:o:freebsd:freebsd:2.0.1:*:*:*:*:*:*:*
freebsd freebsd 2.0.5 cpe:2.3:o:freebsd:freebsd:2.0.5:*:*:*:*:*:*:*
freebsd freebsd 2.1 cpe:2.3:o:freebsd:freebsd:2.1:stable:*:*:*:*:*:*
freebsd freebsd 2.1.0 cpe:2.3:o:freebsd:freebsd:2.1.0:*:*:*:*:*:*:*
freebsd freebsd 2.1.5 cpe:2.3:o:freebsd:freebsd:2.1.5:*:*:*:*:*:*:*
freebsd freebsd 2.1.6 cpe:2.3:o:freebsd:freebsd:2.1.6:*:*:*:*:*:*:*
freebsd freebsd 2.1.6.1 cpe:2.3:o:freebsd:freebsd:2.1.6.1:*:*:*:*:*:*:*
freebsd freebsd 2.1.7 cpe:2.3:o:freebsd:freebsd:2.1.7:*:*:*:*:*:*:*
freebsd freebsd 2.1.7.1 cpe:2.3:o:freebsd:freebsd:2.1.7.1:*:*:*:*:*:*:*
freebsd freebsd 2.2 cpe:2.3:o:freebsd:freebsd:2.2:*:*:*:*:*:*:*
freebsd freebsd 2.2 cpe:2.3:o:freebsd:freebsd:2.2:current:*:*:*:*:*:*
freebsd freebsd 2.2.1 cpe:2.3:o:freebsd:freebsd:2.2.1:*:*:*:*:*:*:*
freebsd freebsd 2.2.2 cpe:2.3:o:freebsd:freebsd:2.2.2:*:*:*:*:*:*:*
freebsd freebsd 2.2.3 cpe:2.3:o:freebsd:freebsd:2.2.3:*:*:*:*:*:*:*
freebsd freebsd 2.2.4 cpe:2.3:o:freebsd:freebsd:2.2.4:*:*:*:*:*:*:*
freebsd freebsd 2.2.5 cpe:2.3:o:freebsd:freebsd:2.2.5:*:*:*:*:*:*:*
freebsd freebsd 2.2.6 cpe:2.3:o:freebsd:freebsd:2.2.6:*:*:*:*:*:*:*
freebsd freebsd 2.2.7 cpe:2.3:o:freebsd:freebsd:2.2.7:*:*:*:*:*:*:*
freebsd freebsd 2.2.8 cpe:2.3:o:freebsd:freebsd:2.2.8:*:*:*:*:*:*:*
freebsd freebsd 3.0 cpe:2.3:o:freebsd:freebsd:3.0:*:*:*:*:*:*:*
freebsd freebsd 3.0 cpe:2.3:o:freebsd:freebsd:3.0:releng:*:*:*:*:*:*
freebsd freebsd 3.1 cpe:2.3:o:freebsd:freebsd:3.1:*:*:*:*:*:*:*
freebsd freebsd 3.2 cpe:2.3:o:freebsd:freebsd:3.2:*:*:*:*:*:*:*
freebsd freebsd 3.3 cpe:2.3:o:freebsd:freebsd:3.3:*:*:*:*:*:*:*
freebsd freebsd 3.4 cpe:2.3:o:freebsd:freebsd:3.4:*:*:*:*:*:*:*
freebsd freebsd 3.5 cpe:2.3:o:freebsd:freebsd:3.5:*:*:*:*:*:*:*
freebsd freebsd 3.5 cpe:2.3:o:freebsd:freebsd:3.5:stable:*:*:*:*:*:*
freebsd freebsd 3.5.1 cpe:2.3:o:freebsd:freebsd:3.5.1:*:*:*:*:*:*:*
freebsd freebsd 3.5.1 cpe:2.3:o:freebsd:freebsd:3.5.1:release:*:*:*:*:*:*
freebsd freebsd 3.5.1 cpe:2.3:o:freebsd:freebsd:3.5.1:stable:*:*:*:*:*:*
freebsd freebsd 4.0 cpe:2.3:o:freebsd:freebsd:4.0:*:*:*:*:*:*:*
freebsd freebsd 4.0 cpe:2.3:o:freebsd:freebsd:4.0:alpha:*:*:*:*:*:*
freebsd freebsd 4.0 cpe:2.3:o:freebsd:freebsd:4.0:releng:*:*:*:*:*:*
freebsd freebsd 4.1 cpe:2.3:o:freebsd:freebsd:4.1:*:*:*:*:*:*:*
freebsd freebsd 4.1.1 cpe:2.3:o:freebsd:freebsd:4.1.1:*:*:*:*:*:*:*
freebsd freebsd 4.2 cpe:2.3:o:freebsd:freebsd:4.2:*:*:*:*:*:*:*
freebsd freebsd 4.3 cpe:2.3:o:freebsd:freebsd:4.3:*:*:*:*:*:*:*
ibm aix 4.3 cpe:2.3:o:ibm:aix:4.3:*:*:*:*:*:*:*
ibm aix 4.3.1 cpe:2.3:o:ibm:aix:4.3.1:*:*:*:*:*:*:*
ibm aix 4.3.2 cpe:2.3:o:ibm:aix:4.3.2:*:*:*:*:*:*:*
ibm aix 4.3.3 cpe:2.3:o:ibm:aix:4.3.3:*:*:*:*:*:*:*
ibm aix 5.1 cpe:2.3:o:ibm:aix:5.1:*:*:*:*:*:*:*
netbsd netbsd 1.0 cpe:2.3:o:netbsd:netbsd:1.0:*:*:*:*:*:*:*
netbsd netbsd 1.1 cpe:2.3:o:netbsd:netbsd:1.1:*:*:*:*:*:*:*
netbsd netbsd 1.2 cpe:2.3:o:netbsd:netbsd:1.2:*:*:*:*:*:*:*
netbsd netbsd 1.2.1 cpe:2.3:o:netbsd:netbsd:1.2.1:*:*:*:*:*:*:*
netbsd netbsd 1.3 cpe:2.3:o:netbsd:netbsd:1.3:*:*:*:*:*:*:*
netbsd netbsd 1.3.1 cpe:2.3:o:netbsd:netbsd:1.3.1:*:*:*:*:*:*:*
netbsd netbsd 1.3.2 cpe:2.3:o:netbsd:netbsd:1.3.2:*:*:*:*:*:*:*
netbsd netbsd 1.3.3 cpe:2.3:o:netbsd:netbsd:1.3.3:*:*:*:*:*:*:*
netbsd netbsd 1.4 cpe:2.3:o:netbsd:netbsd:1.4:*:*:*:*:*:*:*
netbsd netbsd 1.4.1 cpe:2.3:o:netbsd:netbsd:1.4.1:*:*:*:*:*:*:*
netbsd netbsd 1.4.2 cpe:2.3:o:netbsd:netbsd:1.4.2:*:*:*:*:*:*:*
netbsd netbsd 1.4.3 cpe:2.3:o:netbsd:netbsd:1.4.3:*:*:*:*:*:*:*
netbsd netbsd 1.5 cpe:2.3:o:netbsd:netbsd:1.5:*:*:*:*:*:*:*
netbsd netbsd 1.5.1 cpe:2.3:o:netbsd:netbsd:1.5.1:*:*:*:*:*:*:*
openbsd openbsd 2.0 cpe:2.3:o:openbsd:openbsd:2.0:*:*:*:*:*:*:*
openbsd openbsd 2.1 cpe:2.3:o:openbsd:openbsd:2.1:*:*:*:*:*:*:*
openbsd openbsd 2.2 cpe:2.3:o:openbsd:openbsd:2.2:*:*:*:*:*:*:*
openbsd openbsd 2.3 cpe:2.3:o:openbsd:openbsd:2.3:*:*:*:*:*:*:*
openbsd openbsd 2.4 cpe:2.3:o:openbsd:openbsd:2.4:*:*:*:*:*:*:*
openbsd openbsd 2.5 cpe:2.3:o:openbsd:openbsd:2.5:*:*:*:*:*:*:*
openbsd openbsd 2.6 cpe:2.3:o:openbsd:openbsd:2.6:*:*:*:*:*:*:*
openbsd openbsd 2.7 cpe:2.3:o:openbsd:openbsd:2.7:*:*:*:*:*:*:*
openbsd openbsd 2.8 cpe:2.3:o:openbsd:openbsd:2.8:*:*:*:*:*:*:*
sun solaris 2.6 cpe:2.3:o:sun:solaris:2.6:*:*:*:*:*:*:*
sun sunos 5.0 cpe:2.3:o:sun:sunos:5.0:*:*:*:*:*:*:*
sun sunos 5.1 cpe:2.3:o:sun:sunos:5.1:*:*:*:*:*:*:*
sun sunos 5.2 cpe:2.3:o:sun:sunos:5.2:*:*:*:*:*:*:*

References for CVE-2001-0554

URL Tags
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:49.telnetd.asc Broken Link Patch Vendor Advisory
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2001-012.txt.asc Broken Link
ftp://patches.sgi.com/support/free/security/advisories/20010801-01-P Broken Link
ftp://stage.caldera.com/pub/security/openserver/CSSA-2001-SCO.10/CSSA-2001-SCO.10.txt Broken Link
http://archives.neohapsis.com/archives/hp/2001-q4/0014.html Broken Link
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000413 Broken Link
http://ftp.support.compaq.com/patches/.new/html/SSRT0745U.shtml Broken Link
http://online.securityfocus.com/advisories/3476 Broken Link Third Party Advisory VDB Entry
http://online.securityfocus.com/archive/1/199496 Broken Link Third Party Advisory VDB Entry
http://online.securityfocus.com/archive/1/199541 Broken Link Third Party Advisory VDB Entry
http://online.securityfocus.com/archive/1/203000 Broken Link Third Party Advisory VDB Entry
http://www.calderasystems.com/support/security/advisories/CSSA-2001-030.0.txt Broken Link
http://www.cert.org/advisories/CA-2001-21.html Patch Third Party Advisory US Government Resource
http://www.ciac.org/ciac/bulletins/l-131.shtml Broken Link
http://www.cisco.com/warp/public/707/catos-telrcv-vuln-pub.shtml Third Party Advisory
http://www.debian.org/security/2001/dsa-070 Third Party Advisory
http://www.debian.org/security/2001/dsa-075 Third Party Advisory
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-068.php3 Broken Link
http://www.novell.com/linux/security/advisories/2001_029_nkitb_txt.html Broken Link
http://www.osvdb.org/809 Broken Link
http://www.redhat.com/support/errata/RHSA-2001-099.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2001-100.html Third Party Advisory
http://www.securityfocus.com/archive/1/197804 Exploit Third Party Advisory VDB Entry Vendor Advisory
http://www.securityfocus.com/bid/3064 Exploit Patch Third Party Advisory VDB Entry Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/6875 Third Party Advisory VDB Entry
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