VDB-170555 · CVE-2021-27878 · GCVE-0-2021-27878

Veritas Backup Exec up to 21.1 TLS Communication improper authentication

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.9	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Veritas Backup Exec up to 21.1. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component TLS Communication Handler. The manipulation leads to improper authentication. This vulnerability is referenced as CVE-2021-27878. Remote exploitation of the attack is possible. Furthermore, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Veritas Backup Exec up to 21.1 (Backup Software) and classified as critical. This issue affects an unknown function of the component TLS Communication Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability.

The weakness was published 03/02/2021. It is possible to read the advisory at veritas.com. The identification of this vulnerability is CVE-2021-27878. Technical details are unknown but a public exploit is available.

The exploit is available at packetstormsecurity.com. It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 04/07/2023 with a due date of 04/28/2023:

Apply updates per vendor instructions.

Upgrading to version 21.2 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Backup Software

Name

Veritas Backup Exec

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CNA Base Score: 8.8
CNA Vector (MITRE): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Attacked
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Veritas Backup Exec 21.2

Timelineinfo

03/01/2021 🔍
03/02/2021 +1 days 🔍
03/02/2021 +0 days 🔍
03/07/2025 +1466 days 🔍

Sourcesinfo

Advisory: veritas.com
Status: Confirmed

CVE: CVE-2021-27878 (🔍)
GCVE (CVE): GCVE-0-2021-27878
GCVE (VulDB): GCVE-100-170555
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/02/2021 08:11
Updated: 03/07/2025 17:17
Changes: 03/02/2021 08:11 (38), 03/06/2021 07:57 (5), 03/06/2021 08:03 (1), 03/14/2021 09:39 (7), 04/28/2024 12:21 (27), 06/29/2024 14:20 (2), 09/27/2024 13:49 (2), 03/07/2025 17:17 (21)
Complete: 🔍
Cache ID: 216::103