The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certa
The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.
- Published
- Jan 14, 2016
- Updated
- Jun 16, 2026
- EPSS
- 20.9% · 97th percentile
- CWE
- CWE-119
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Report tools
Action score
38
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 6 / 30 · 20.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| oracle | linux | cpe:2.3:o:oracle:linux |
| oracle | solaris | cpe:2.3:o:oracle:solaris |
| openbsd | openssh | cpe:2.3:a:openbsd:openssh |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| hp | virtual customer access system | cpe:2.3:o:hp:virtual_customer_access_system |
| sophos | unified threat management software | cpe:2.3:a:sophos:unified_threat_management_software |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple mac os x10.11.0 and later · up to 10.11.3 inclusive
- apple mac os x10.9.0 and later · up to 10.9.5 inclusive
- apple mac os x10.10.0 and later · up to 10.10.5 inclusive
- hp virtual customer access systemup to 15.07 inclusive
- openbsd openssh5.4
- openbsd openssh5.5
- openbsd openssh5.6
- openbsd openssh5.7
- openbsd openssh5.8
- openbsd openssh5.9
- openbsd openssh6.0
- openbsd openssh6.1
- openbsd openssh6.2
- openbsd openssh6.3
- openbsd openssh6.4
- openbsd openssh6.5
- openbsd openssh6.6
- openbsd openssh6.7
- openbsd openssh6.8
- openbsd openssh6.9
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | openssh | before 1:7.1p2-1 | 1:7.1p2-1 |
| Debian:6.0 | openssh | before 1:5.5p1-6+squeeze8 | 1:5.5p1-6+squeeze8 |
| Debian:7 | openssh | before 1:6.0p1-4+deb7u3 | 1:6.0p1-4+deb7u3 |
| Debian:8 | openssh | before 1:6.7p1-5+deb8u1 | 1:6.7p1-5+deb8u1 |
| openSUSE:Tumbleweed | openssh | before 7.2p2-3.1 | 7.2p2-3.1 |
| Red Hat:enterprise_linux:7::client | openssh | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-askpass | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-clients | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-debuginfo | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-keycat | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-ldap | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-server | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | openssh-server-sysvinit | before 0:6.6.1p1-23.el7_2 | 0:6.6.1p1-23.el7_2 |
| Red Hat:enterprise_linux:7::client | pam_ssh_agent_auth | before 0:0.9.3-9.23.el7_2 | 0:0.9.3-9.23.el7_2 |
| SUSE:Linux Enterprise Desktop 11 SP3 | openssh | before 6.2p2-0.24.1 | 6.2p2-0.24.1 |
| SUSE:Linux Enterprise Desktop 11 SP3 | openssh-askpass-gnome | before 6.2p2-0.24.3 | 6.2p2-0.24.3 |
| SUSE:Linux Enterprise Desktop 11 SP4 | openssh | before 6.6p1-16.1 | 6.6p1-16.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | openssh-askpass-gnome | before 6.6p1-16.4 | 6.6p1-16.4 |
| SUSE:Linux Enterprise Desktop 12 | openssh | before 6.6p1-33.1 | 6.6p1-33.1 |
| SUSE:Linux Enterprise Desktop 12 | openssh-askpass-gnome | before 6.6p1-33.1 | 6.6p1-33.1 |
| SUSE:Linux Enterprise Server 11-SECURITY | openssh-openssl1 | before 6.6p1-10.1 | 6.6p1-10.1 |
Same product
oracle: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-4554mime_header.cc in Squid before 3.5.18 allows remote attackers to bypass intended same-origin restrictions and possibly conduct cache-poisoni46Plan
- CVE-2016-5408Stack-based buffer overflow in the munge_other_line function in cachemgr.cgi in the squid package before 3.1.23-16.el6_8.6 in Red Hat Enterp40Plan
- CVE-2016-3587Unspecified vulnerability in Oracle Java SE 8u92 and Java SE Embedded 8u91 allows remote attackers to affect confidentiality, integrity, and40Plan
- CVE-2016-3606Unspecified vulnerability in Oracle Java SE 7u101 and 8u92 and Java SE Embedded 8u91 allows remote attackers to affect confidentiality, inte39Monitor
- CVE-2022-21505In the linux kernel, if IMA appraisal is used with the "ima_appraise=log" boot param, lockdown can be defeated with kexec on any machine whe26Monitor
- CVE-2022-21499KGDB and KDB allow read and write access to kernel memory, and thus should be restricted during lockdown.26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:openssh | 1:7.1p2-1 · Debian:12 | Package registry (OSV) |
| opensuse:openssh | 7.2p2-3.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:openssh | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-askpass | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-clients | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-debuginfo | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-keycat | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-ldap | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-server | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:openssh-server-sysvinit | 0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:pam_ssh_agent_auth | 0:0.9.3-9.23.el7_2 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:openssh | 6.6p1-33.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:openssh-askpass-gnome | 6.6p1-33.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:openssh-openssl1 | 6.6p1-10.1 · SUSE:Linux Enterprise Server 11-SECURITY | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
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
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
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.
- Special conditions such as timing or configuration are required.
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
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10734
- lists.apple.com/archives/security-announce/2016/Mar/msg00004.html
- lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.html
- lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.html
- lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.html
- packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.html
- seclists.org/fulldisclosure/2016/Jan/44
- www.debian.org/security/2016/dsa-3446
- www.openssh.com/txt/release-7.1p2
- www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
- www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- www.securityfocus.com/archive/1/537295/100/0/threaded
- www.securityfocus.com/bid/80698
- www.securitytracker.com/id/1034671
- www.ubuntu.com/usn/USN-2869-1
Vendor advisories and official records. Exploit/PoC links are deliberately left out.