OpenSSL 1.0.1/1.0.2 BN_hex2bn/BN_dec2bn() integer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical has been found in OpenSSL 1.0.1/1.0.2 (Network Encryption Software). Affected is an unknown function of the file BN_hex2bn/BN_dec2bn(). The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-190. This is going to have an impact on availability.

The weakness was shared 03/01/2016 by Guido Vranken as 20160301.txt as confirmed advisory (Website). The advisory is shared for download at This vulnerability is traded as CVE-2016-0797 since 12/16/2015. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (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 168833 (OpenSuSE Security Update for libopenssl0_9_8 (openSUSE-SU-2016:1241-1)).

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 83763), X-Force (111142), Vulnerability Center (SBV-57004) and Tenable (89842). The entries 81112, 81133, 81138 and 81139 are related to this item.




CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 8.7
VulDB Meta Temp Score: 7.5

VulDB Base Score: 9.8
VulDB Temp Score: 8.5
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NVD Base Score: 7.5
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Class: Memory corruption
CWE: CWE-190
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Current Price Estimation: 🔍


Nessus ID: 89842
Nessus Name: Amazon Linux AMI : openssl (ALAS-2016-661) (DROWN) (SLOTH)
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OpenVAS ID: 12024
OpenVAS Name: Mageia Linux Local Check: mgasa-2016-0093
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Threat Intelligenceinfoedit

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Recommended: Upgrade
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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 🔍
05/22/2018 +802 days 🔍
09/01/2018 +102 days 🔍



Advisory: 20160301.txt
Researcher: Guido Vranken
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0797 (🔍)

SecurityFocus: 83763 - OpenSSL CVE-2016-0797 Multiple Integer Overflow Vulnerabilities
X-Force: 111142 - OpenSSL BN_hex2bn/BN_dec2bn() denial of service
Vulnerability Center: 57004 - OpenSSL Remote Heap Corruption due to Insufficient Memory Allocation - CVE-2016-0797, High

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Created: 03/03/2016 10:45 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
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