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CVE-2019-1551

rsaz_512_sqr overflow bug on x86_64

Medium5.3EPSS 14.3%
Published
Updated
Reserved
Assigned by
openssl

Description

There is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).

Scores

CVSS scores of CVE-2019-1551, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (exploitation in 30 days)
14.3% · top 3.4% of all CVEs (7 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 5.3.

Weakness

Affected products

  • OpenSSL · OpenSSL

    • affected Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d)
    • affected Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t)

References (24)

Sources

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

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Record last updated .