CVE-2001-0554Kerberos Buffer Overflow
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 Jul 18, 2001 · Updated Aug 8, 2024
Key Facts
Patch immediately- CVE-2001-0554 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Kerberos (Mit), Kerberos 5 (Mit), Linux Netkit (Netkit) and 8 more products.
- It is exploited in the wild, listed in Industry KEV feed since Jul 18, 2001. Public exploit code is available.
- EPSS estimates a 39% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v2
10.0
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
39%
Higher than 98.5% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
46/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Jul 18, 2001
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisoryMSS-OAR-E01-2001:298
- advisory20010725 Telnetd AYT overflow scanner
- advisory20010725 SCO - Telnetd AYT overflow ?
- advisory20010810 ADV/EXP: netkit <=0.17 in.telnetd remote buffer overflow
- advisoryRHSA-2001:099
- advisoryRHSA-2001:100
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jul 18, 2001 | n/a | Not reported |
Affected Products
87 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| KerberosMit | 1.0 | n/a |
| Kerberos 5Mit | 1.1, 1.1.1, 1.2, 1.2.1, 1.2.2 | n/a |
| Linux NetkitNetkit | 0.10, 0.11, 0.12 | n/a |
| Debian LinuxDebian | 2.2 | n/a |
| FreebsdFreebsd | 2.0, 2.0.1, 2.0.5, 2.1.0, 2.1.5, 2.1.6, 2.1.6.1, 2.1.7 | n/a |
Timeline
Publicly disclosed
Jul 18, 2001
Added to Industry KEV feed
Jul 18, 2001
Last updated
Aug 8, 2024
Weakness Type
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
- advisoryMSS-OAR-E01-2001:298
- advisory20010725 Telnetd AYT overflow scanner
- advisory20010725 SCO - Telnetd AYT overflow ?
- advisory20010810 ADV/EXP: netkit <=0.17 in.telnetd remote buffer overflow
- advisoryRHSA-2001:099
FAQ
Common Questions.
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.
Affected: Kerberos (Mit) versions 1.0; Kerberos 5 (Mit) versions 1.1, 1.1.1, 1.2, 1.2.1, 1.2.2; Linux Netkit (Netkit) versions 0.10, 0.11, 0.12, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jul 18, 2001.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2001-0554 On Your Attack Surface?
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