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CVE-2018-0734

Timing attack against DSA

Description

The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a (Affected 1.1.1). Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p).

Timeline

  1. ID reserved

    By openssl

  2. · 11 months later

    Published

  3. · 8 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2018-0734, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
12.2% · top 3.8% of all CVEs (9 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Affected products

  • OpenSSL · OpenSSL

    • affected Fixed in OpenSSL 1.1.1a (Affected 1.1.1)
    • affected Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i)
    • affected Fixed in OpenSSL 1.0.2q (Affected 1.0.2-1.0.2p)

References

29

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .