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NVD / CVE Program· CNA redhat

CVE-2016-0777: 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 servers to obtain…

MediumCVSS 6.5 · v3.1—Proof of concept Fix available

Noroxi assessment

Priority: Plan (action score 45/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 63.4% (FIRST EPSS); higher than 99.2% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: openssh (Debian:12) 1:7.1p2-1; openssh (Debian:6.0) 1:5.5p1-6+squeeze8; openssh (Debian:7) 1:6.0p1-4+deb7u3.

Add it to your regular patch cycle. Upgrade to openssh (Debian:12) 1:7.1p2-1; openssh (Debian:6.0) 1:5.5p1-6+squeeze8; openssh (Debian:7) 1:6.0p1-4+deb7u3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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 servers to obtain sensitive information from process memory by requesting transmission of an entire buffer, as demonstrated by reading a private key.

Published
Jan 14, 2016
Updated
Jun 16, 2026
EPSS
63.4% · 99th percentile

Report tools

JSON

Action score

45

Plan

Add it to your regular patch cycle.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
19 / 30 · 63.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2016-0777

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
sophosunified threat management software
sophosunified threat management
oraclelinux
oraclesolaris
openbsdopenssh
hpremote device access virtual customer access system
applemac os x

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apple mac os xup to 10.11.3 inclusive
  • hp remote device access virtual customer access systemup to 15.07 inclusive
  • openbsd openssh5.0
  • openbsd openssh5.1
  • openbsd openssh5.2
  • openbsd openssh5.3
  • openbsd openssh5.4
  • openbsd openssh5.5
+12 more rows
  • 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

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12opensshbefore 1:7.1p2-11:7.1p2-1
Debian:6.0opensshbefore 1:5.5p1-6+squeeze81:5.5p1-6+squeeze8
Debian:7opensshbefore 1:6.0p1-4+deb7u31:6.0p1-4+deb7u3
Debian:8opensshbefore 1:6.7p1-5+deb8u11:6.7p1-5+deb8u1
openSUSE:Tumbleweedopensshbefore 7.2p2-3.17.2p2-3.1
Red Hat:enterprise_linux:7::clientopensshbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-askpassbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-clientsbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-debuginfobefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-keycatbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-ldapbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-serverbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientopenssh-server-sysvinitbefore 0:6.6.1p1-23.el7_20:6.6.1p1-23.el7_2
Red Hat:enterprise_linux:7::clientpam_ssh_agent_authbefore 0:0.9.3-9.23.el7_20:0.9.3-9.23.el7_2
SUSE:Linux Enterprise Desktop 11 SP3opensshbefore 6.2p2-0.24.16.2p2-0.24.1
SUSE:Linux Enterprise Desktop 11 SP3openssh-askpass-gnomebefore 6.2p2-0.24.36.2p2-0.24.3
SUSE:Linux Enterprise Desktop 11 SP4opensshbefore 6.6p1-16.16.6p1-16.1
SUSE:Linux Enterprise Desktop 11 SP4openssh-askpass-gnomebefore 6.6p1-16.46.6p1-16.4
SUSE:Linux Enterprise Desktop 12opensshbefore 6.6p1-33.16.6p1-33.1
SUSE:Linux Enterprise Desktop 12openssh-askpass-gnomebefore 6.6p1-33.16.6p1-33.1
SUSE:Linux Enterprise Server 11-SECURITYopenssh-openssl1before 6.6p1-10.16.6p1-10.1

Same product

sophos: all records

Other highest-scoring records for the same primary product.

  • CVE-2013-5932Unspecified vulnerability in WebAdmin in Sophos UTM (aka Astaro Security Gateway) before 9.105 has unknown impact and attack vectors.
    42Plan
  • CVE-2014-2537Memory leak in the TCP stack in the kernel in Sophos UTM before 9.109 allows remote attackers to cause a denial of service (memory…
    32Monitor
  • CVE-2016-2046Cross-site scripting (XSS) vulnerability in the UserPortal page in SOPHOS UTM before 9.353 allows remote attackers to inject arbitrary web…
    25Monitor

Published before and after this one in the same product

  • Later →CVE-2016-7397Oct 3, 2016 · The Frontend component in Sophos UTM with firmware 9.405-5 and earlier allows local administrators to obtain sensitive password information…
    17Monitor
  • Later →CVE-2016-7442Oct 3, 2016 · The Frontend component in Sophos UTM with firmware 9.405-5 and earlier allows local administrators to obtain sensitive password information…
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:openssh1:7.1p2-1 · Debian:12Package registry (OSV)
opensuse:openssh7.2p2-3.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:openssh0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-askpass0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-clients0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-debuginfo0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-keycat0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-ldap0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-server0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssh-server-sysvinit0:6.6.1p1-23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:pam_ssh_agent_auth0:0.9.3-9.23.el7_2 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:openssh6.6p1-33.1 · SUSE:Linux Enterprise Desktop 12Package registry (OSV)
suse:openssh-askpass-gnome6.6p1-33.1 · SUSE:Linux Enterprise Desktop 12Package registry (OSV)
suse:openssh-openssl16.6p1-10.1 · SUSE:Linux Enterprise Server 11-SECURITYPackage registry (OSV)

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

  • Proof-of-concept repository on GitHub ×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.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02025-11-11

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.

  1. Published
  2. First PoC+3588 d
  3. TodayNov 14, 2026+3956 d

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records