CVE-2016-0777
MediumThe 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 Aug 4, 2026 · Also known as DEBIAN-CVE-2016-0777, DLA-387-1, DSA-3446-1, SUSE-SU-2016:0117-1, SUSE-SU-2016:0118-1, SUSE-SU-2016:0119-1, SUSE-SU-2016:0120-1, UBUNTU-CVE-2016-0777, USN-2869-1
Key Facts
Patch immediately- CVE-2016-0777 is a medium-severity vulnerability (CVSS 6.5 v3.1) affecting Remote Device Access Virtual Customer Access System (Hp), Openssh (Openbsd), Unified Threat Management Software (Sophos) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 63% probability of exploitation in the next 30 days.
- Fixed versions are available, including Mac OS X 10.11.3, Remote Device Access Virtual Customer Access System 15.07, Openssh 0:6.6.1p1-23.el7_2.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
63%
Higher than 99.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2016-0777 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Affected Products
181 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Remote Device Access Virtual Customer Access SystemHp | See advisory | 15.07 |
| OpensshOpenbsd | 5.0, 5.0-p1, 5.1, 5.1-p1, 5.2, 5.2-p1, 5.3, 5.3-p1 | 1:7.1p2-1 |
| Unified Threat Management SoftwareSophos | 9.318, 9.353 | n/a |
| Mac OS XApple | See advisory | 10.11.3 |
| LinuxOracle | 7 | n/a |
Patched Releases
Mac OS X
10.11.3
Remote Device Access Virtual Customer Access System
15.07
Openssh
0:6.6.1p1-23.el7_2, 1:5.5p1-6+squeeze8, 1:6.0p1-4+deb7u3, 1:6.6p1-2ubuntu2.4, 1:6.7p1-5+deb8u1, 1:7.1p2-1, 5.3p1-124.el6_10+sp999, 5.8p1-11.1, 6.2p2-0.24.1, 6.6.1p1-23.59.amzn1, 6.6.1p1-23.el7_2, 6.6p1-16.1, 6.6p1-33.1, 6.6p1-5.3.1, 6.6p1-8.1, 7.2p2-3.1
openssh-askpass
5.8p1-11.1, 6.2p2-0.24.1, 6.6.1p1-23.el7_2
openssh-askpass-debuginfo
5.8p1-11.1
openssh-askpass-gnome
5.8p1-11.1, 6.2p2-0.24.3, 6.6p1-16.4, 6.6p1-33.1, 6.6p1-5.3.1, 6.6p1-8.1
openssh-askpass-gnome-debuginfo
5.8p1-11.1, 6.6p1-5.3.1
openssh-cavs
6.6p1-8.1, 7.2p2-3.1
openssh-clients
6.6.1p1-23.59.amzn1, 6.6.1p1-23.el7_2
openssh-debuginfo
5.8p1-11.1, 6.6p1-5.3.1
openssh-debugsource
5.8p1-11.1, 6.6p1-5.3.1
openssh-fips
6.6p1-16.1, 6.6p1-33.1, 6.6p1-5.3.1, 6.6p1-8.1, 7.2p2-3.1
openssh-helpers
6.6p1-16.1, 6.6p1-33.1, 6.6p1-5.3.1, 6.6p1-8.1, 7.2p2-3.1
openssh-helpers-debuginfo
6.6p1-5.3.1
openssh-keycat
6.6.1p1-23.59.amzn1, 6.6.1p1-23.el7_2
openssh-ldap
6.6.1p1-23.59.amzn1, 6.6.1p1-23.el7_2
openssh-openssl1
6.6p1-10.1
openssh-openssl1-helpers
6.6p1-10.1
openssh-server
6.6.1p1-23.59.amzn1, 6.6.1p1-23.el7_2
openssh-server-sysvinit
6.6.1p1-23.el7_2
pam_ssh_agent_auth
0.9.3-9.23.59.amzn1, 0.9.3-9.23.el7_2
rootio-openssh
1:7.1p2-1
seal-openssh
5.3p1-124.el6_10+sp999
Timeline
Publicly disclosed
Jan 14, 2016
Last updated
Aug 4, 2026
Weakness Type
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- CWE-682 Incorrect Calculation
References
- advisoryhttp://article.gmane.org/gmane.comp.security.oss.general/18580
- advisoryhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734
- advisoryAPPLE-SA-2016-03-21-5
- advisoryFEDORA-2016-2e89eba0c1
- advisoryFEDORA-2016-67c6ef0d4f
FAQ
Common Questions.
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.
Affected: Remote Device Access Virtual Customer Access System (Hp); Openssh (Openbsd) versions 5.0, 5.0-p1, 5.1, 5.1-p1, 5.2, 5.2-p1, 5.3, 5.3-p1; Unified Threat Management Software (Sophos) versions 9.318, 9.353, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Mac OS X 10.11.3, Remote Device Access Virtual Customer Access System 15.07, Openssh 0:6.6.1p1-23.el7_2.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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