CVE-2016-2176

CVE-2016-2176 is a high-severity vulnerability in Openssl with a CVSS 3.x base score of 8.2. Its EPSS exploit-prediction score of 23% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

• Severity: High (CVSS 3.x base score 8.2)
• CVSS v2: 6.4
• EPSS exploit prediction: 23% (98th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Openssl
• Published: 2016-05-05
• Last modified: 2026-06-17

Description

The X509_NAME_oneline function in crypto/x509/x509_obj.c in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to obtain sensitive information from process stack memory or cause a denial of service (buffer over-read) via crafted EBCDIC ASN.1 data.

Frequently asked questions

What is CVE-2016-2176?

The X509_NAME_oneline function in crypto/x509/x509_obj.c in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to obtain sensitive information from process stack memory or cause a denial of service (buffer over-read) via crafted EBCDIC ASN.1 data.

How severe is CVE-2016-2176?

CVE-2016-2176 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2016-2176 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2176?

CVE-2016-2176 primarily affects Openssl. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-2176?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-2176 published?

CVE-2016-2176 was published on 2016-05-05 and last updated on 2026-06-17.

References

• http://lists.apple.com/archives/security-announce/2016/Jul/msg00000.html
• http://packetstormsecurity.com/files/136912/Slackware-Security-Advisory-openssl-Updates.html
• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160504-openssl
• http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
• http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
• http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/89746
• http://www.securityfocus.com/bid/91787
• http://www.securitytracker.com/id/1035721
• http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.542103
• https://bto.bluecoat.com/security-advisory/sa123
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
• https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=2919516136a4227d9e6d8f2fe66ef976aaf8c561
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03756en_us
• https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03765en_us
• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40202
• https://kc.mcafee.com/corporate/index?page=content&id=SB10160
• https://security.gentoo.org/glsa/201612-16
• https://security.netapp.com/advisory/ntap-20160504-0001/
• https://support.apple.com/HT206903
• https://www.openssl.org/news/secadv/20160503.txt
• https://www.tenable.com/security/tns-2016-18

Affected products (12)

• cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2:beta1:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2:beta2:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2:beta3:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2a:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2b:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2c:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2d:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2e:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2f:*:*:*:*:*:*:*
• cpe:2.3:a:openssl:openssl:1.0.2g:*:*:*:*:*:*:*

More vulnerabilities in Openssl

• CVE-2009-3245 — Critical (CVSS 10.0): OpenSSL before 0.9.8m does not check for a NULL return value from bn_wexpand function calls in (1) crypto/bn/bn_div.c,…
• CVE-2006-3738 — Critical (CVSS 10.0): Buffer overflow in the SSL_get_shared_ciphers function in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier…
• CVE-2026-31789 — Critical (CVSS 9.8): Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer…
• CVE-2022-2274 — Critical (CVSS 9.8): The OpenSSL 3.0.4 release introduced a serious bug in the RSA implementation for X86_64 CPUs supporting the AVX512IFMA…
• CVE-2021-3711 — Critical (CVSS 9.8): In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt().…
• CVE-2016-6309 — Critical (CVSS 9.8): statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote…

All CVEs affecting Openssl →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

• CVE-2026-77946 — Critical (CVSS 10.0): A vulnerability was determined in TRENDnet TEW-821DAP 2.2.01b05. Affected by this vulnerability is the function…
• CVE-2026-76008 — Critical (CVSS 10.0): A flaw has been found in Comfast CF-N1-S 2.6.0.1. This affects the function get_para_from_uri of the file…
• CVE-2026-75784 — Critical (CVSS 10.0): A vulnerability was detected in TRENDnet TEW-WLC100 1v2.07b01. Affected by this issue is the function FUN_0040da4c of…
• CVE-2026-74843 — Critical (CVSS 10.0): A vulnerability was determined in Wavlink WN531P3 and WN535M1 V250922. Affected by this vulnerability is the function…
• CVE-2026-16367 — Critical (CVSS 10.0): Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox…
• CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 218.4.91.163 (ipv4-addr)
• 200.77.172.159 (ipv4-addr)
• 166.62.41.190 (ipv4-addr)
• 50.62.22.47 (ipv4-addr)
• 222.99.52.202 (ipv4-addr)
• 200.196.50.91 (ipv4-addr)
• 192.169.197.123 (ipv4-addr)
• 191.101.33.225 (ipv4-addr)