Vulnerability Monitor

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CVE-2016-0702

The MOD_EXP_CTIME_COPY_FROM_PREBUF function in crypto/bn/bn_exp.c in OpenSSL 1.0.1 before 1.0.1s and 1.0.2 before 1.0.2g does not properly consider cache-bank access times during modular exponentiation, which makes it easier for local users to discover RSA keys by running a crafted application on the same Intel Sandy Bridge CPU core as a victim and leveraging cache-bank conflicts, aka a "CacheBleed" attack.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.1, requiring local system access to exploit but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), for affected systems. Impacting 4 products from openssl, from nodejs, from debian and 1 other, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2016, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2016-03-03T20:59:00.080

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.1: 5.1 (MEDIUM)

CVSSv2 Vector

AV:L/AC:M/Au:N/C:P/I:N/A:N

  • Access Vector: LOCAL
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: NONE
  • Availability Impact: NONE
Exploitability Score

3.4

Impact Score

2.9

Weaknesses
  • Type: Primary
    CWE-200
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application openssl openssl 1.0.1 Yes
Application openssl openssl 1.0.1 Yes
Application openssl openssl 1.0.1 Yes
Application openssl openssl 1.0.1 Yes
Application openssl openssl 1.0.1a Yes
Application openssl openssl 1.0.1b Yes
Application openssl openssl 1.0.1c Yes
Application openssl openssl 1.0.1d Yes
Application openssl openssl 1.0.1e Yes
Application openssl openssl 1.0.1f Yes
Application openssl openssl 1.0.1g Yes
Application openssl openssl 1.0.1h Yes
Application openssl openssl 1.0.1i Yes
Application openssl openssl 1.0.1j Yes
Application openssl openssl 1.0.1k Yes
Application openssl openssl 1.0.1l Yes
Application openssl openssl 1.0.1m Yes
Application openssl openssl 1.0.1n Yes
Application openssl openssl 1.0.1o Yes
Application openssl openssl 1.0.1p Yes
Application openssl openssl 1.0.1q Yes
Application openssl openssl 1.0.1r Yes
Application openssl openssl 1.0.2 Yes
Application openssl openssl 1.0.2 Yes
Application openssl openssl 1.0.2 Yes
Application openssl openssl 1.0.2 Yes
Application openssl openssl 1.0.2a Yes
Application openssl openssl 1.0.2b Yes
Application openssl openssl 1.0.2c Yes
Application openssl openssl 1.0.2d Yes
Application openssl openssl 1.0.2e Yes
Application openssl openssl 1.0.2f Yes
Application nodejs node.js ≤ 4.1.2 Yes
Application nodejs node.js < 4.3.2 Yes
Application nodejs node.js < 5.7.1 Yes
Operating System debian debian_linux 7.0 Yes
Operating System debian debian_linux 8.0 Yes
Operating System canonical ubuntu_linux 12.04 Yes
Operating System canonical ubuntu_linux 14.04 Yes
Operating System canonical ubuntu_linux 15.10 Yes
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For openssl's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.