JLSEC-2026-216 There is an overflow bug in the `x64_64` Montgomery squaring procedure used in exponentiation with...

There is an overflow bug in the x6464 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...

openssl: Integer overflow in RSAZ modular exponentiation on x86_64

An integer overflow was found in the x6464 Montgomery squaring procedure used in exponentiation with 512-bit moduli. As per upstream: No EC algorithms are affected. Attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are...

BSA-2020-893

Security Advisory ID : BSA-2020-893 Component : OpenSSL Revision : 2.0: Final There is an overflow bug in the x6464 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...

DEBIAN-CVE-2019-1551

There is an overflow bug in the x6464 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...

PT-2015-3386

Name of the Vulnerable Software and Affected Versions OpenSSL versions 1.0.2 through 1.0.2e Description The Montgomery squaring implementation in crypto/bn/asm/x86 64-mont5.pl mishandles carry propagation and produces incorrect output, making it easier for remote attackers to obtain sensitive...