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Openssh CVE-2016-3115

MEDIUM
Improper Neutralization of CRLF Sequences ('CRLF Injection') (CWE-93)
2016-03-22 cve@mitre.org
6.4
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization CRLF sequence sanitization
Impact

CVSS score of 6.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 47.11%.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 47.1% exploitation probability (EPSS)

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AnalysisAI

Multiple CRLF injection vulnerabilities in session.c in sshd in OpenSSH before 7.2p2 allow remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data,. Rated medium severity (CVSS 6.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 47.1%.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

This vulnerability is classified under CWE-93. Multiple CRLF injection vulnerabilities in session.c in sshd in OpenSSH before 7.2p2 allow remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data, related to the (1) do_authenticated1 and (2) session_x11_req functions. Affected products include: Openbsd Openssh, Oracle Vm Server. Version information: before 7.2.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 6.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionCVE.org

Multiple CRLF injection vulnerabilities in session.c in sshd in OpenSSH before 7.2p2 allow remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data, related to the (1) do_authenticated1 and (2) session_x11_req functions.

Threat Intelligence Overview

Threat Score
4.2/10
Composite threat intelligence
EPSS Score
47.1%
Top 2% exploitable
Exploit
POC
Public exploit code exists
Data Quality
6 sources
Confidence: High
NVD CVE.org EPSS Exploit-DB GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 47.1%
Patch available No
Active threat Yes
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

99
Low Medium High Critical
KEV: 0
EPSS: +47
CVSS: +32
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:openbsd:openssh:*:p1:*:*:*:*:*:*
cpe:2.3:o:oracle:vm_server:3.2:*:*:*:*:*:*:*
CVE-2023-38408 CRITICAL POC
9.8 Jul 20

The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remot

CVE-2023-25136 MEDIUM POC
6.5 Feb 03

OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. Rated medium se

CVE-2016-6210 MEDIUM POC
5.9 Feb 13

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static

CVE-2015-5600 HIGH POC
8.1 Aug 03

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processin

CVE-2016-6515 HIGH POC
7.5 Aug 07

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password a

CVE-2024-6387 HIGH POC
8.1 Jul 01

Remote code execution in OpenSSH's sshd server (regression of CVE-2006-5051) allows unauthenticated remote attackers to

CVE-2019-6111 MEDIUM POC
5.9 Jan 31

An issue was discovered in OpenSSH 7.9. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no

CVE-2025-26465 MEDIUM
6.8 Feb 18

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. Rated medium severity (CVSS 6.8), this

CVE-2023-48795 MEDIUM POC
5.9 Dec 18

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remot

CVE-2016-0777 MEDIUM
6.5 Jan 14

The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote serv

CVE-2019-6110 MEDIUM POC
6.8 Jan 31

In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-T

CVE-2025-26466 MEDIUM
5.9 Feb 28

A flaw was found in the OpenSSH package. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, n

References

Advisories & patches
ADVISORY http://www.openssh.com/txt/x11fwd.adv ADVISORY http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html ADVISORY https://vuldb.com/vuln/81320 REF http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/session.c REF http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/session.c.diff?r1=1.281&r2=1.282&f=h REF http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183101.html REF http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183122.html REF http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178838.html REF http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179924.html REF http://lists.fedoraproject.org/pipermail/package-announce/2016-March/180491.html REF http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184264.html REF http://packetstormsecurity.com/files/136234/OpenSSH-7.2p1-xauth-Command-Injection-Bypass.html REF http://rhn.redhat.com/errata/RHSA-2016-0465.html REF http://rhn.redhat.com/errata/RHSA-2016-0466.html REF http://seclists.org/fulldisclosure/2016/Mar/46 REF http://seclists.org/fulldisclosure/2016/Mar/47 REF http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html REF http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html REF http://www.securityfocus.com/bid/84314 REF http://www.securitytracker.com/id/1035249 REF https://bto.bluecoat.com/security-advisory/sa121 REF https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html REF https://security.gentoo.org/glsa/201612-18 REF https://www.freebsd.org/security/advisories/FreeBSD-SA-16:14.openssh.asc

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