What is the CVSS score of CVE-2021-27514?

CVE-2021-27514 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 3.5%.

Is there a public PoC exploit available for CVE-2021-27514?

Yes, a public proof-of-concept exploit is available for CVE-2021-27514. Prioritise patching immediately. EPSS: 3.5%.

Is there a patch available for CVE-2021-27514?

Yes, a patch is available for CVE-2021-27514. Update the affected software to the latest version immediately.

Eyesofnetwork CVE-2021-27514

CRITICAL

Improper Restriction of Excessive Authentication Attempts (CWE-307)

2021-02-22 cve@mitre.org

Authentication Bypass Eyesofnetwork

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-307 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Brute-force prevention, rate limiting
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 3.5% exploitation probability (EPSS)

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AnalysisAI

EyesOfNetwork 5.3-10 uses an integer of between 8 and 10 digits for the session ID, which might be leveraged for brute-force authentication bypass (such as in CVE-2021-27513 exploitation). Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-307. EyesOfNetwork 5.3-10 uses an integer of between 8 and 10 digits for the session ID, which might be leveraged for brute-force authentication bypass (such as in CVE-2021-27513 exploitation). Affected products include: Eyesofnetwork.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

EyesOfNetwork 5.3-10 uses an integer of between 8 and 10 digits for the session ID, which might be leveraged for brute-force authentication bypass (such as in CVE-2021-27513 exploitation).

Threat Intelligence Overview

EPSS Score

3.5%

Top 12% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 3.5%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +4

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:eyesofnetwork:eyesofnetwork:5.3-10:*:*:*:*:*:*:*

More in Eyesofnetwork

View all

CVE-2020-9465 CRITICAL Emergency POC

9.8 Feb 28

An issue was discovered in EyesOfNetwork eonweb 5.1 through 5.3 before 5.3-3. Rated critical severity (CVSS 9.8), this v

CVE-2020-8656 CRITICAL Emergency POC

9.8 Feb 07

An issue was discovered in EyesOfNetwork 5.3. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploit

CVE-2020-8657 CRITICAL Emergency POC

9.8 Feb 06

An issue was discovered in EyesOfNetwork 5.3. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploit

CVE-2020-8654 HIGH Act Now POC

8.8 Feb 07

An issue was discovered in EyesOfNetwork 5.3. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable

CVE-2017-1000060 CRITICAL Act Now POC

9.8 Jul 17

EyesOfNetwork (EON) 5.1 Unauthenticated SQL Injection in eonweb leading to remote root. Rated critical severity (CVSS 9.

CVE-2020-8655 HIGH Act Now POC

7.8 Feb 07

An issue was discovered in EyesOfNetwork 5.3. Rated high severity (CVSS 7.8), this vulnerability is no authentication re

CVE-2017-14403 CRITICAL Act Now POC

9.8 Sep 13

The EyesOfNetwork web interface (aka eonweb) 5.1-0 has SQL injection via the term parameter to module/admin_group/search

CVE-2017-14402 CRITICAL Act Now POC

9.8 Sep 13

The EyesOfNetwork web interface (aka eonweb) 5.1-0 has SQL injection via the user_name parameter to module/admin_user/ad

CVE-2017-14401 CRITICAL Act Now POC

9.8 Sep 13

The EyesOfNetwork web interface (aka eonweb) 5.1-0 has SQL injection via the user_name parameter to module/admin_user/ad

CVE-2017-14252 CRITICAL Act Now POC

9.8 Sep 11

SQL Injection exists in the EyesOfNetwork web interface (aka eonweb) 5.1-0 via the group_id cookie to side.php. Rated cr

CVE-2017-14247 CRITICAL Act Now POC

9.8 Sep 11

SQL Injection exists in the EyesOfNetwork web interface (aka eonweb) 5.1-0 via the user_id cookie to header.php, a relat

CVE-2017-14119 HIGH This Week POC

8.8 Sep 03

In the EyesOfNetwork web interface (aka eonweb) 5.1-0, module\tool_all\tools\snmpwalk.php does not properly restrict pop

Same weakness CWE-307 – Improper Restriction of Excessive Authentication Attempts

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CVE-2015-3306 CRITICAL POC

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CVE-2012-4681 CRITICAL POC

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CVE-2013-2465 CRITICAL POC

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CVE-2011-3544 CRITICAL POC

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CVE-2022-40684 CRITICAL POC

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CVE-2025-61882 CRITICAL POC

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CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

PATCH https://github.com/EyesOfNetworkCommunity/eonweb/issues/87

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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