OpenSSL 1.0.1/1.0.2 DSA Key double free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in OpenSSL 1.0.1/1.0.2 (Network Encryption Software). It has been declared as critical. This vulnerability affects an unknown code block of the component DSA Key Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-415. As an impact it is known to affect availability.

The weakness was disclosed 03/01/2016 by Adam Langley as 20160301.txt as confirmed advisory (Website). The advisory is available at This vulnerability was named CVE-2016-0705 since 12/16/2015. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/01/2018).

The vulnerability scanner Nessus provides a plugin with the ID 89842 (Amazon Linux AMI : openssl (ALAS-2016-661) (DROWN) (SLOTH)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371180 (IBM Java SDK Multiple Vulnerabilities (Oracle July 17 2018 CPU (1.6.0_201, 1.7.0_191, 1.8.0_181))).

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 83754), X-Force (111140), Vulnerability Center (SBV-57003) and Tenable (89842). The entries 81112, 81133, 81138 and 81139 are pretty similar.




CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 8.5

VulDB Base Score: 9.8
VulDB Temp Score: 8.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍



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Class: Memory corruption
CWE: CWE-415
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 89842
Nessus Name: Amazon Linux AMI : openssl (ALAS-2016-661) (DROWN) (SLOTH)
Nessus File: 🔍
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Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 12024
OpenVAS Name: Mageia Linux Local Check: mgasa-2016-0093
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfoedit

Threat: 🔍
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Remediation: 🔍


Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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12/16/2015 🔍
02/29/2016 +75 days 🔍
03/01/2016 +0 days 🔍
03/01/2016 +0 days 🔍
03/01/2016 +0 days 🔍
03/03/2016 +1 days 🔍
03/03/2016 +0 days 🔍
03/05/2016 +2 days 🔍
03/10/2016 +5 days 🔍
02/13/2017 +340 days 🔍
09/01/2018 +564 days 🔍



Advisory: 20160301.txt
Researcher: Adam Langley
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0705 (🔍)

SecurityFocus: 83754 - OpenSSL CVE-2016-0705 Denial of Service Vulnerability
X-Force: 111140 - OpenSSL DSA key denial of service
Vulnerability Center: 57003 - OpenSSL Remote Code Execution via Malformed DSA Private Keys - CVE-2016-0705, High

See also: 🔍


Created: 03/03/2016 10:43 AM
Updated: 09/01/2018 08:39 AM
Changes: (19) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a advisory_person_name advisory_confirm_url source_oval_id source_securityfocus_date source_securityfocus_class
Complete: 🔍


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