CVE-2017-3738
There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.4%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 13.41% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- openssl/openssl · debian/debian linux · nodejs/node.js
- Source
- openssl-security@openssl.org
EPSS 13.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/102118Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039978Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:0998Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2185Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2186Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2187Third Party Advisory
- https://github.com/openssl/openssl/commit/e502cc86df9dafded1694fceb3228ee34d11c11aPatch, Third Party Advisory
- https://nodejs.org/en/blog/vulnerability/december-2017-security-releases/Vendor Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.ascThird Party Advisory
- https://security.gentoo.org/glsa/201712-03Third Party Advisory
- https://security.netapp.com/advisory/ntap-20171208-0001/Third Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_usThird Party Advisory
- https://www.debian.org/security/2017/dsa-4065Third Party Advisory
- https://www.debian.org/security/2018/dsa-4157Third Party Advisory
- https://www.openssl.org/news/secadv/20171207.txtVendor Advisory
- https://www.openssl.org/news/secadv/20180327.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.htmlPatch, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
- https://www.tenable.com/security/tns-2017-16Third Party Advisory
- https://www.tenable.com/security/tns-2018-04Third Party Advisory
- https://www.tenable.com/security/tns-2018-06Third Party Advisory
- https://www.tenable.com/security/tns-2018-07Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.