CVE-2021-27877

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Jun 17, 2026

Description

An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

No affected versions have been published.

Timeline

Published: Mar 1, 2021
Last modified: Jun 17, 2026
Added to CISA KEV: Apr 7, 2023
NVD status: Analyzed

Related CVEs from 2021

CVE-2021-278788.8An issue was discovered in Veritas Backup Exec before 21.2. The communication between a client and an Agent requires successful authenticati CVE-2021-278845.1Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs bec CVE-2021-278858.8usersettings.php in e107 through 2.3.0 lacks a certain e_TOKEN protection mechanism.CVE-2021-278869.8rakibtg Docker Dashboard before 2021-02-28 allows command injection in backend/utilities/terminal.js via shell metacharacters in the command CVE-2021-278875.4Cross-site Scripting (XSS) vulnerability in the main dashboard of Ellipse APM versions allows an authenticated user or integrated applicatio CVE-2021-278886.1ZendTo before 6.06-4 Beta allows XSS during the display of a drop-off in which a filename has unexpected characters.CVE-2021-278896.1Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.CVE-2021-278908.8SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.CVE-2021-278918.8SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.CVE-2021-278927.8SSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation. ConnectSecure on Windows is affected.CVE-2021-278937.0SSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation in nonstandard conditions. ConnectSecure on Windows i CVE-2021-278997.4The Proofpoint Insider Threat Management Agents (formerly ObserveIT Agent) for MacOS and Linux perform improper validation of the ITM Server