CVE-2016-2109

HIGH

OpenSSL < 1.0.1s - Denial of Service via ASN.1 BIO Short Invalid Encoding

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-2109. PoCs published by codecat007.

AI-analyzed exploit summary This PoC exploits CVE-2016-2109, a memory corruption vulnerability in OpenSSL's ASN.1 parsing. It triggers a malloc error by feeding malformed ASN.1 data to `d2i_X509_bio`, demonstrating the DoS condition.

Description

The asn1_d2i_read_bio function in crypto/asn1/a_d2i_fp.c in the ASN.1 BIO implementation in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to cause a denial of service (memory consumption) via a short invalid encoding.

Exploits (1)

github WORKING POC 8 stars

by codecat007 · cpoc

https://github.com/codecat007/cvehub/tree/main/android/securityPatch/CVE-2016-2109

View Code ZIP pw:eip

This PoC exploits CVE-2016-2109, a memory corruption vulnerability in OpenSSL's ASN.1 parsing. It triggers a malloc error by feeding malformed ASN.1 data to `d2i_X509_bio`, demonstrating the DoS condition.

Classification

Working Poc 95%

Attack Type

Dos

Complexity

Trivial

Reliability

Reliable

Target: OpenSSL (affecting Android systems)

No auth needed

Prerequisites: OpenSSL library with vulnerable ASN.1 parsing

MITRE ATT&CK

T1499 - Endpoint Denial of Service

devstral-2 · analyzed Feb 27, 2026 Full analysis →

References (55)

Core 55

Core References

Vendor Advisory vendor-advisory

http://rhn.redhat.com/errata/RHSA-2016-2056.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00014.html

Vendor Advisory vendor-advisory

http://rhn.redhat.com/errata/RHSA-2016-2073.html

Third Party Advisory vendor-advisory

http://www.debian.org/security/2016/dsa-3566

Third Party Advisory vendor-advisory

https://security.gentoo.org/glsa/201612-16

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00008.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00015.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00001.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00010.html

Mailing List vendor-advisory

http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00055.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00011.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00013.html

Vendor Advisory vendor-advisory

http://rhn.redhat.com/errata/RHSA-2016-0996.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00036.html

Vendor Advisory vendor-advisory

http://rhn.redhat.com/errata/RHSA-2016-2957.html

Vendor Advisory vendor-advisory

http://rhn.redhat.com/errata/RHSA-2016-0722.html

Vendor Advisory

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759

Vendor Advisory vendor-advisory

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.542103

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00018.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00029.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00019.html

Third Party Advisory, VDB Entry vdb-entry

http://www.securitytracker.com/id/1035721

Various Sources vendor-advisory

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160504-openssl

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00016.html

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

Vendor Advisory

https://www.openssl.org/news/secadv/20160503.txt

Vendor Advisory

https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03756en_us

Vendor Advisory

https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03765en_us

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00017.html

Third Party Advisory, VDB Entry vdb-entry

http://www.securityfocus.com/bid/91787

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00030.html

Vendor Advisory vendor-advisory

http://www.ubuntu.com/usn/USN-2959-1

Third Party Advisory, VDB Entry vdb-entry

http://www.securityfocus.com/bid/87940

Vendor Advisory

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149

Vendor Advisory

https://support.apple.com/HT206903

Vendor Advisory

http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

Vendor Advisory

http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

Vendor Advisory

http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html

Vendor Advisory

http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html

Third Party Advisory

https://www.tenable.com/security/tns-2016-18

Vendor Advisory

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722

Vendor Advisory

https://source.android.com/security/bulletin/2017-07-01

Vendor Advisory

https://kc.mcafee.com/corporate/index?page=content&id=SB10160

Vendor Advisory

https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Vendor Advisory

https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=c62981390d6cf9e3d612c489b8b77c2913b25807

Various Sources

https://bto.bluecoat.com/security-advisory/sa123

Various Sources

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40202

Vendor Advisory

https://security.netapp.com/advisory/ntap-20160504-0001/

Vendor Advisory vendor-advisory

https://www.freebsd.org/security/advisories/FreeBSD-SA-16:17.openssl.asc

Vendor Advisory

http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

Exploit, Third Party Advisory

http://packetstormsecurity.com/files/136912/Slackware-Security-Advisory-openssl-Updates.html

Scores

CVSS v3 7.5

EPSS 0.5794

EPSS Percentile 98.2%

Attack Vector NETWORK

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

Details

CWE

CWE-399

Status published

Products (20)

openssl/openssl 1.0.2 (4 CPE variants)

openssl/openssl 1.0.2a

openssl/openssl 1.0.2b

openssl/openssl 1.0.2c

openssl/openssl 1.0.2d

openssl/openssl 1.0.2e

openssl/openssl 1.0.2f

openssl/openssl 1.0.2g

openssl/openssl < 1.0.1s

redhat/enterprise_linux_desktop 7.0

... and 10 more

Published May 05, 2016

Tracked Since Feb 18, 2026