There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

Published : 2017-05-04 20:29 Updated : 2019-07-02 15:12

CVSS Score More info
Score 2.6 / 10
Vendor Product Version URI
Openssl Openssl 1.0.2 cpe:/a:openssl:openssl:1.0.2:beta1
Openssl Openssl 1.0.2 cpe:/a:openssl:openssl:1.0.2:beta2
Openssl Openssl 1.0.2 cpe:/a:openssl:openssl:1.0.2:beta3
Openssl Openssl 1.0.2a cpe:/a:openssl:openssl:1.0.2a
Openssl Openssl 1.0.2b cpe:/a:openssl:openssl:1.0.2b
Openssl Openssl 1.0.2c cpe:/a:openssl:openssl:1.0.2c
Openssl Openssl 1.0.2d cpe:/a:openssl:openssl:1.0.2d
Openssl Openssl 1.0.2e cpe:/a:openssl:openssl:1.0.2e
Openssl Openssl 1.0.2f cpe:/a:openssl:openssl:1.0.2f
Openssl Openssl 1.0.2g cpe:/a:openssl:openssl:1.0.2g
Openssl Openssl 1.0.2h cpe:/a:openssl:openssl:1.0.2h
Openssl Openssl 1.0.2i cpe:/a:openssl:openssl:1.0.2i
Openssl Openssl 1.0.2j cpe:/a:openssl:openssl:1.0.2j
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:-
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:pre1
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:pre2
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:pre3
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:pre4
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:pre5
Openssl Openssl 1.1.0 cpe:/a:openssl:openssl:1.1.0:pre6
Openssl Openssl 1.1.0a cpe:/a:openssl:openssl:1.1.0a
Openssl Openssl 1.0.2 cpe:/a:openssl:openssl:1.0.2
Openssl Openssl 1.1.0b cpe:/a:openssl:openssl:1.1.0b
  1. Openssl (1) Search CVE
    1. Openssl (14) Search CVE
      1. 1.0.2
      2. 1.0.2a
      3. 1.0.2b
      4. 1.0.2c
      5. 1.0.2d
      6. 1.0.2e
      7. 1.0.2f
      8. 1.0.2g
      9. 1.0.2h
      10. 1.0.2i
      11. 1.0.2j
      12. 1.1.0
      13. 1.1.0a
      14. 1.1.0b


ID Name Description Links
CWE-320 Key Management Errors Weaknesses in this category are related to errors in the management of cryptographic keys. CVE

History of changes

Date Event
2019-07-02 15:12
2019-04-23 19:29
2018-07-14 01:29
2018-01-18 18:18
2017-11-21 02:29
2017-11-03 01:29
2017-10-20 01:29
2017-08-09 05:26
2017-07-31 12:01
2017-07-01 05:35
2017-05-30 05:26
2017-05-04 20:29