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USN-5051-2: OpenSSL vulnerability

26 August 2021

OpenSSL could be made to crash or expose sensitive information if it received a specially crafted ASN.1 string.



  • openssl - Secure Socket Layer (SSL) cryptographic library and tools


USN-5051-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1
strings. A remote attacker could use this issue to cause OpenSSL to crash,
resulting in a denial of service, or possibly obtain sensitive information.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04
Ubuntu 14.04

After a standard system update you need to reboot your computer to make
all the necessary changes.


Related notices

  • USN-5051-1: openssl, libssl1.1, libssl-doc, libssl-dev
  • USN-5051-3: libssl1.0.0, openssl1.0, libssl1.0-dev
  • USN-5088-1: qemu-efi-aarch64, ovmf, qemu-efi, edk2, ovmf-ia32, qemu-efi-arm