Off-by-one error in the channel code of OpenSSH 2.0 through 3.0.2 allows local users or remote malicious servers to gain privileges.
- Published
- Mar 15, 2002
- Updated
- Jun 16, 2026
- EPSS
- 14.7% · 97th percentile
- CWE
- CWE-193
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Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 14.7%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| immunix | immunix | cpe:2.3:a:immunix:immunix |
| mandrakesoft | mandrake single network firewall | cpe:2.3:a:mandrakesoft:mandrake_single_network_firewall |
| openbsd | openssh | cpe:2.3:a:openbsd:openssh |
| openpkg | openpkg | cpe:2.3:a:openpkg:openpkg |
| conectiva | linux | cpe:2.3:o:conectiva:linux |
| engardelinux | secure linux | cpe:2.3:o:engardelinux:secure_linux |
| mandrakesoft | mandrake linux | cpe:2.3:o:mandrakesoft:mandrake_linux |
| mandrakesoft | mandrake linux corporate server | cpe:2.3:o:mandrakesoft:mandrake_linux_corporate_server |
| redhat | linux | cpe:2.3:o:redhat:linux |
| suse | suse linux | cpe:2.3:o:suse:suse_linux |
| trustix | secure linux | cpe:2.3:o:trustix:secure_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- conectiva linux5.0
- conectiva linux5.1
- conectiva linux6.0
- conectiva linux7.0
- conectiva linuxecommerce
- conectiva linuxgraficas
- engardelinux secure linux1.0.1
- immunix immunix7.0
- mandrakesoft mandrake linux7.1
- mandrakesoft mandrake linux7.2
- mandrakesoft mandrake linux8.0
- mandrakesoft mandrake linux8.1
- mandrakesoft mandrake linux corporate server1.0.1
- mandrakesoft mandrake single network firewall7.2
- openbsd openssh2.0 and later · before 3.1
- openpkg openpkg1.0
- redhat linux7.0
- redhat linux7.1
- redhat linux7.2
- suse suse linux6.4
Same product
immunix: all recordsOther highest-scoring records for the same primary product.
- CVE-2002-1565Buffer overflow in url_filename function for wget 1.8.1 allows attackers to cause a denial of service (segmentation fault) and possibly exec31Monitor
- CVE-2000-1208Format string vulnerability in startprinting() function of printjob.c in BSD-based lpr lpd package may allow local users to gain privileges 28Monitor
- CVE-2000-1134Multiple shell programs on various Unix systems, including (1) tcsh, (2) csh, (3) sh, and (4) bash, follow symlinks when processing << redir28Monitor
- CVE-2000-1095modprobe in the modutils 2.3.x package on Linux systems allows a local user to execute arbitrary commands via shell metacharacters.28Monitor
- CVE-2000-0963Buffer overflow in ncurses library allows local users to execute arbitrary commands via long environmental information such as TERM or TERMI28Monitor
- CVE-2001-0738LogLine function in klogd in sysklogd 1.3 in various Linux distributions allows an attacker to cause a denial of service (hang) by causing n21Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | remote | 2002-03-07 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- First PoC-8 d
- Published
- TodaySep 30, 2026+8965 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-193 · Off-by-one ErrorCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:13.openssh.asc
- ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2002-004.txt.asc
- ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.10/CSSA-2002-SCO.10.txt
- ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.11/CSSA-2002-SCO.11.txt
- archives.neohapsis.com/archives/bugtraq/2002-03/0108.html
- archives.neohapsis.com/archives/vulnwatch/2002-q1/0060.html
- distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000467
- marc.info/?l=bugtraq&m=101552065005254&w=2
- marc.info/?l=bugtraq&m=101553908201861&w=2
- marc.info/?l=bugtraq&m=101561384821761&w=2
- marc.info/?l=bugtraq&m=101586991827622&w=2
- online.securityfocus.com/advisories/3960
- online.securityfocus.com/archive/1/264657
- www.calderasystems.com/support/security/advisories/CSSA-2002-012.0.txt
- www.debian.org/security/2002/dsa-119
- www.iss.net/security_center/static/8383.php
- www.linux-mandrake.com/en/security/2002/MDKSA-2002-019.php
- www.linuxsecurity.com/advisories/other_advisory-1937.html
- www.novell.com/linux/security/advisories/2002_009_openssh_txt.html
- www.openbsd.org/advisories/ssh_channelalloc.txt
Vendor advisories and official records. Exploit/PoC links are deliberately left out.