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NVD / CVE Program· CNA redhat

CVE-2016-7056: A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256…

MediumCVSS 5.5 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.61% (FIRST EPSS); higher than 50.1% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: openssl (Debian:12) 1.0.2a-1; openssl (Debian:7) 1.0.1t-1+deb7u2; openssl (Debian:8) 1.0.1t-1+deb8u6.

Low priority for now. Upgrade to openssl (Debian:12) 1.0.2a-1; openssl (Debian:7) 1.0.1t-1+deb7u2; openssl (Debian:8) 1.0.1t-1+deb8u6 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

A timing attack flaw was found in OpenSSL 1.0.1u and before that could allow a malicious user with local access to recover ECDSA P-256 private keys.

Published
Sep 10, 2018
Updated
Jun 16, 2026
EPSS
0.6% · 50th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CNA vs NVD score

NVD
5.5
CNA · redhat
5.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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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
opensslopenssl
debiandebian linux
redhatenterprise linux
canonicalubuntu linux

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • The OpenSSL Project openssl

    • openssl 1.0.1uaffected
Affected versions · NVD (7)

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

  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • debian debian linux8.0
  • debian debian linux9.0
  • openssl opensslup to 1.0.1u inclusive
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12opensslbefore 1.0.2a-11.0.2a-1
Debian:7opensslbefore 1.0.1t-1+deb7u21.0.1t-1+deb7u2
Debian:8opensslbefore 1.0.1t-1+deb8u61.0.1t-1+deb8u6
openSUSE:Tumbleweedopenssl-1_0_0before 1.0.2u-6.21.0.2u-6.2
Red Hat:enterprise_linux:7::clientopensslbefore 1:1.0.2k-8.el71:1.0.2k-8.el7
Red Hat:enterprise_linux:7::clientopenssl-debuginfobefore 1:1.0.2k-8.el71:1.0.2k-8.el7
Red Hat:enterprise_linux:7::clientopenssl-develbefore 1:1.0.2k-8.el71:1.0.2k-8.el7
Red Hat:enterprise_linux:7::clientopenssl-libsbefore 1:1.0.2k-8.el71:1.0.2k-8.el7
Red Hat:enterprise_linux:7::clientopenssl-perlbefore 1:1.0.2k-8.el71:1.0.2k-8.el7
Red Hat:enterprise_linux:7::clientopenssl-staticbefore 1:1.0.2k-8.el71:1.0.2k-8.el7
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpdbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-debuginfobefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-develbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-libsbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-manualbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-selinuxbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-httpd-toolsbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_ldapbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_proxy_htmlbefore 1:2.4.23-120.jbcs.el61:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_securitybefore 0:2.9.1-19.GA.jbcs.el60:2.9.1-19.GA.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_security-debuginfobefore 0:2.9.1-19.GA.jbcs.el60:2.9.1-19.GA.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_sessionbefore 0:2.4.23-120.jbcs.el60:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-mod_sslbefore 1:2.4.23-120.jbcs.el61:2.4.23-120.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-opensslbefore 1:1.0.2h-13.jbcs.el61:1.0.2h-13.jbcs.el6

+83

Same product

openssl: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows…KEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This week
  • CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code…
    65This week

Published before and after this one in the same product

  • ← EarlierCVE-2018-0737Apr 16, 2018 · Cache timing vulnerability in RSA Key Generation
    26Monitor
  • ← EarlierCVE-2018-0732Jun 12, 2018 · Client DoS due to large DH parameter
    44Plan
  • Later →CVE-2018-0735Oct 29, 2018 · Timing attack against ECDSA signature generation
    24Monitor

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:openssl1.0.2a-1 · Debian:12Package registry (OSV)
opensuse:openssl-1_0_01.0.2u-6.2 · openSUSE:TumbleweedPackage registry (OSV)
red hat:jbcs-httpd24-httpd0:2.4.23-120.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-debuginfo0:2.4.23-120.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-devel0:2.4.23-120.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-libs0:2.4.23-120.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-manual0:2.4.23-120.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-httpd-selinux0:2.4.23-120.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:openssl1:1.0.2k-8.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-debuginfo1:1.0.2k-8.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-devel1:1.0.2k-8.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-libs1:1.0.2k-8.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-perl1:1.0.2k-8.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-static1:1.0.2k-8.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:compat-openssl0980.9.8j-105.1 · SUSE:Linux Enterprise Desktop 12 SP1Package registry (OSV)
suse:openssl1.0.1i-54.5.1 · SUSE:Linux Enterprise Desktop 12 SP1Package registry (OSV)
suse:openssl11.0.1g-0.57.1 · SUSE:Linux Enterprise Server 11-SECURITYPackage 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.

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

Technical details

Attack conditions

  • Someone with local access to the system 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-385 · Covert Timing Channel

CVSS vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

ATT&CK techniques

—

References

Show all references (15 more)

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

All records