CVE-2021-25310 Vulnerability Analysis & Exploit Details

CVE-2021-25310
Vulnerability Scoring

8.8
/10
Severe Risk

Cybersecurity professionals consider CVE-2021-25310 an immediate threat requiring urgent mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-25310 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:54 UTC
Originally published on: 🕒 02 Feb 2021, 15:15 UTC

Time between publication and last update: 1387 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2021-25310 Vulnerability Summary

CVE-2021-25310: The administration web interface on Belkin Linksys WRT160NL 1.0.04.002_US_20130619 devices allows remote authenticated attackers to execute system commands with root privileges via shell metacharacters in the ui_language POST parameter to the apply.cgi form endpoint. This occurs in do_upgrade_post in mini_httpd. NOTE: This vulnerability only affects products that are no longer supported by the maintaine

Assessing the Risk of CVE-2021-25310

Access Complexity Graph

The exploitability of CVE-2021-25310 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-25310

CVE-2021-25310 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-25310, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-25310, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2021-25310 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-25310 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2021-25310 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.966% (probability of exploit)

EPSS Percentile: 83.55% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 16.450000000000003% of others.

CVE-2021-25310 References

External References

CWE Common Weakness Enumeration

CWE-150

CAPEC Common Attack Pattern Enumeration and Classification

  • Email Injection CAPEC-134 An adversary manipulates the headers and content of an email message by injecting data via the use of delimiter characters native to the protocol.
  • Using Meta-characters in E-mail Headers to Inject Malicious Payloads CAPEC-41 This type of attack involves an attacker leveraging meta-characters in email headers to inject improper behavior into email programs. Email software has become increasingly sophisticated and feature-rich. In addition, email applications are ubiquitous and connected directly to the Web making them ideal targets to launch and propagate attacks. As the user demand for new functionality in email applications grows, they become more like browsers with complex rendering and plug in routines. As more email functionality is included and abstracted from the user, this creates opportunities for attackers. Virtually all email applications do not list email header information by default, however the email header contains valuable attacker vectors for the attacker to exploit particularly if the behavior of the email client application is known. Meta-characters are hidden from the user, but can contain scripts, enumerations, probes, and other attacks against the user's system.
  • Web Server Logs Tampering CAPEC-81 Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.
  • Log Injection-Tampering-Forging CAPEC-93 This attack targets the log files of the target host. The attacker injects, manipulates or forges malicious log entries in the log file, allowing them to mislead a log audit, cover traces of attack, or perform other malicious actions. The target host is not properly controlling log access. As a result tainted data is resulting in the log files leading to a failure in accountability, non-repudiation and incident forensics capability.

Vulnerable Configurations

  • cpe:2.3:o:belkin:linksys_wrt160nl_firmware:1.0.04.002_us_20130619:*:*:*:*:*:*:*
    cpe:2.3:o:belkin:linksys_wrt160nl_firmware:1.0.04.002_us_20130619:*:*:*:*:*:*:*
  • cpe:2.3:h:belkin:linksys_wrt160nl:-:*:*:*:*:*:*:*
    cpe:2.3:h:belkin:linksys_wrt160nl:-:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-25310: Combat Critical CVE Threats

Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.

Other 5 Recently Published CVEs Vulnerabilities

  • CVE-2025-2129 – A vulnerability was found in Mage AI 0.9.75. It has been classified as problematic. This affects an unknown part. The manipulation leads to insecur...
  • CVE-2025-2127 – A vulnerability was found in JoomlaUX JUX Real Estate 3.4.0 on Joomla. It has been classified as problematic. Affected is an unknown function of th...
  • CVE-2025-2126 – A vulnerability was found in JoomlaUX JUX Real Estate 3.4.0 on Joomla and classified as critical. This issue affects some unknown processing of the...
  • CVE-2025-2125 – A vulnerability has been found in Control iD RH iD 25.2.25.0 and classified as problematic. This vulnerability affects unknown code of the file /v2...
  • CVE-2025-2124 – A vulnerability, which was classified as problematic, was found in Control iD RH iD 25.2.25.0. This affects an unknown part of the file /v2/custome...