CVE-2016-0701
LowThe DH_check_pub_key function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for Diffie-Hellman (DH) key exchange, which makes it easier for remote attackers to discover a private DH exponent by making multiple…
Published Feb 15, 2016 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2016-0701
Key Facts
Patch immediately- CVE-2016-0701 is a low-severity vulnerability (CVSS 3.7 v3.1) affecting Openssl, rootio-openssl, libopenssl1_0_0-32bit (suse) and 21 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 84% probability of exploitation in the next 30 days.
- Fixed versions are available, including libopenssl-1_1-devel 1.1.1l-1.2, libopenssl-1_1-devel-32bit 1.1.1l-1.2, libopenssl-devel 1.0.1p-71.1.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
3.7
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (30-day exploit likelihood)
84%
Higher than 99.6% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2016-0701 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The DH_check_pub_key function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for Diffie-Hellman (DH) key exchange, which makes it easier for remote attackers to discover a private DH exponent by making multiple handshakes with a peer that chose an inappropriate number, as demonstrated by a number in an X9.42 file.
Affected Products
51 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| OpensslOpenssl | 1.0.2, 1.0.2a, 1.0.2b, 1.0.2-beta1, 1.0.2-beta2, 1.0.2-beta3, 1.0.2c, 1.0.2d | 1.0.2f-2 |
| rootio-opensslrootio | See advisory | 1.0.2f-2 |
| libopenssl1_0_0-32bitsuse | See advisory | 1.0.1p-71.1 |
| libopenssl1_0_0-debuginfo-32bitsuse | See advisory | 1.0.1p-71.1 |
| libopenssl1_0_0-debuginfosuse | See advisory | 1.0.1p-71.1 |
Patched Releases
libopenssl-1_1-devel
1.1.1l-1.2
libopenssl-1_1-devel-32bit
1.1.1l-1.2
libopenssl-devel
1.0.1p-71.1, 1.0.2j-2.2
libopenssl-devel-32bit
1.0.1p-71.1, 1.0.2j-2.2
libopenssl1_0_0
1.0.1p-71.1, 1.0.2j-2.2
libopenssl1_0_0-32bit
1.0.1p-71.1, 1.0.2j-2.2
libopenssl1_0_0-debuginfo
1.0.1p-71.1
libopenssl1_0_0-debuginfo-32bit
1.0.1p-71.1
libopenssl1_0_0-debuginfo-x86
1.0.1p-71.1
libopenssl1_0_0-hmac
1.0.2j-2.2
libopenssl1_0_0-hmac-32bit
1.0.2j-2.2
libopenssl1_0_0-steam
1.0.2h-4.1
libopenssl1_0_0-steam-32bit
1.0.2h-4.1
libopenssl1_0_0-x86
1.0.1p-71.1
libopenssl1_1
1.1.1l-1.2
libopenssl1_1-32bit
1.1.1l-1.2
libopenssl1_1-hmac
1.1.1l-1.2
Openssl
1.0.1p-71.1, 1.0.2f-2, 1.0.2j-2.2
openssl-1_1
1.1.1l-1.2
openssl-1_1-doc
1.1.1l-1.2
openssl-debuginfo
1.0.1p-71.1
openssl-debugsource
1.0.1p-71.1
openssl-doc
1.0.1p-71.1, 1.0.2j-2.2
rootio-openssl
1.0.2f-2
Timeline
Publicly disclosed
Feb 15, 2016
Last updated
Aug 4, 2026
Weakness Type
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2016-0701
- advisoryhttp://www.openssl.org/news/secadv/20160128.txt
- otherhttp://intothesymmetry.blogspot.com/2016/01/openssl-key-recovery-attack-on-dh-small.html
- otherhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
- otherFEDORA-2016-527018d2ff
FAQ
Common Questions.
The DH_check_pub_key function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for Diffie-Hellman (DH) key exchange, which makes it easier for remote attackers to discover a private DH exponent by making multiple handshakes with a peer that chose an inappropriat…
Affected: Openssl versions 1.0.2, 1.0.2a, 1.0.2b, 1.0.2-beta1, 1.0.2-beta2, 1.0.2-beta3, 1.0.2c, 1.0.2d; rootio-openssl; libopenssl1_0_0-32bit (suse), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including libopenssl-1_1-devel 1.1.1l-1.2, libopenssl-1_1-devel-32bit 1.1.1l-1.2, libopenssl-devel 1.0.1p-71.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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