CVE-2019-1551

What it is

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).

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

14.3% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-12-06 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-08 22:16 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 14.3% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-12-06 18:15 UTC

Last modified

2026-10-08 22:16 UTC

Exploit probability

14.3% · EPSS, next 30 days

Weakness

CWE-190 · Integer overflow

Record status

Modified

Affected

• OpenSSL ≤ 1.0.2t
• OpenSSL ≤ 1.1.1d
• Opensuse Leap 15.1
• Oracle Enterprise Manager Ops Center 12.4.0.0
• Oracle MySQL Enterprise Monitor ≤ 4.0.12
• Oracle MySQL Enterprise Monitor ≤ 8.0.20
• Oracle Peoplesoft Enterprise Peopletools 8.56
• Oracle Peoplesoft Enterprise Peopletools 8.57

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1551.md and follow it. Check whether this project is affected by CVE-2019-1551. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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