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Known exploited vulnerability

CVE-2021-27877

criticalCVSS 3.1 9.8In CISA KEVRansomwareEPSS 65%Published · n/a

The short answer

CVE-2021-27877 affects n/a n/a and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-04-07: attackers are using it, so patch it first.

What it is

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.

Severity

9.8 critical

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

Exploited (CISA KEV)

Yes, since Apr 7, 2023

Federal due date Apr 28, 2023

EPSS, next 30 days

65%

Higher than 99% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions.

Affected products

n/a. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-27877 being exploited?

Yes. CISA added CVE-2021-27877 to its Known Exploited Vulnerabilities catalog on 2023-04-07, with a federal remediation due date of 2023-04-28. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2021-27877?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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