5.0
MEDIUM
CVE-2015-2951
F21 JWT Signature Bypass Vulnerability
Description

JWT.php in F21 JWT before 2.0 allows remote attackers to bypass signature verification via crafted tokens.

INFO

Published Date :

June 5, 2015, 10:59 a.m.

Last Modified :

April 12, 2025, 10:46 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

2.9

Exploitability Score :

10.0
Public PoC/Exploit Available at Github

CVE-2015-2951 has a 8 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2015-2951 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 F21 jwt
: Total Affected Vendor : 1 | Products : 1
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2015-2951.

URL Resource
http://jvn.jp/en/jp/JVN06120222/index.html Vendor Advisory
http://jvndb.jvn.jp/jvndb/JVNDB-2015-000073 Vendor Advisory
http://www.securityfocus.com/bid/75021
https://github.com/F21/jwt/commit/a327cf9052df8f9f97728ca0b5fa78a8231b79b6
http://jvn.jp/en/jp/JVN06120222/index.html Vendor Advisory
http://jvndb.jvn.jp/jvndb/JVNDB-2015-000073 Vendor Advisory
http://www.securityfocus.com/bid/75021
https://github.com/F21/jwt/commit/a327cf9052df8f9f97728ca0b5fa78a8231b79b6

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
techleadevelopers/Security-Stuffers-Lab

Security-Stuffers-Lab é um arsenal de guerra cibernética realista: cred stealers, crypto attacks, brute forcers, advanced web exploits, adversarial AI attacks. Um repositório para Red Teams, Threat Hunters e profissionais que buscam ir além da superfície

Python C HTML JavaScript C++ VBScript XSLT Classic ASP PowerShell Batchfile

Updated: 1 day, 4 hours ago
0 stars 0 fork 0 watcher
Born at : April 27, 2025, 5:14 p.m. This repo has been linked 5 different CVEs too.
Profile Photo
z-bool/Venom-JWT

针对JWT渗透开发的漏洞验证/密钥爆破工具，针对CVE-2015-9235/空白密钥/未验证签名攻击/CVE-2016-10555/CVE-2018-0114/CVE-2020-28042的结果生成用于FUZZ，也可使用字典/字符枚举(包括JJWT)的方式进行爆破(JWT Crack)

Go Batchfile

Updated: 2 days, 13 hours ago
232 stars 9 fork 9 watcher
Born at : Jan. 27, 2025, 2:23 p.m. This repo has been linked 5 different CVEs too.
Profile Photo
crpytoscooby/resourses_web

None

Updated: 1 year, 2 months ago
0 stars 1 fork 1 watcher
Born at : Feb. 12, 2024, 6:11 a.m. This repo has been linked 7 different CVEs too.
Profile Photo
puckiestyle/jwt_tool

None

Python

Updated: 2 years, 3 months ago
0 stars 0 fork 0 watcher
Born at : May 10, 2021, 9:32 a.m. This repo has been linked 6 different CVEs too.
Profile Photo
The-Cracker-Technology/jwt_tool

None

Shell Python

Updated: 4 years, 1 month ago
0 stars 0 fork 0 watcher
Born at : March 14, 2021, 5:03 p.m. This repo has been linked 6 different CVEs too.
Profile Photo
mishmashclone/ticarpi-jwt_tool

https://github.com/ticarpi/jwt_tool

Python Dockerfile

Updated: 1 month, 1 week ago
4 stars 0 fork 0 watcher
Born at : Dec. 2, 2019, 9:17 p.m. This repo has been linked 6 different CVEs too.
Profile Photo
ticarpi/jwt_tool

:snake: A toolkit for testing, tweaking and cracking JSON Web Tokens

Python Dockerfile

Updated: 1 day, 23 hours ago
5775 stars 693 fork 693 watcher
Born at : Jan. 23, 2017, 9:13 p.m. This repo has been linked 5 different CVEs too.
Profile Photo
aress31/jwtcat

A CPU-based JSON Web Token (JWT) cracker and - to some extent - scanner.

jwt bruteforce cracker python pentesting pyjwt cve-2018-1000531 signature hs256 cracking cybersecurity authentication authorization bearer-tokens cracking-hashes pentest-tool token

Python

Updated: 3 days, 22 hours ago
306 stars 49 fork 49 watcher
Born at : Jan. 13, 2017, 5:01 p.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2015-2951 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2015-2951 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://jvn.jp/en/jp/JVN06120222/index.html
    Added Reference http://jvndb.jvn.jp/jvndb/JVNDB-2015-000073
    Added Reference http://www.securityfocus.com/bid/75021
    Added Reference https://github.com/F21/jwt/commit/a327cf9052df8f9f97728ca0b5fa78a8231b79b6
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Dec. 03, 2016

    Action Type Old Value New Value
    Added Reference http://www.securityfocus.com/bid/75021 [No Types Assigned]
  • Modified Analysis by [email protected]

    Jun. 05, 2015

    Action Type Old Value New Value
    Added CPE Configuration Configuration 1 OR *cpe:2.3:a:f21:jwt:1.0:*:*:*:*:*:*:* (and previous)
    Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:P/A:N)
    Changed Reference Type http://jvndb.jvn.jp/jvndb/JVNDB-2015-000073 No Types Assigned http://jvndb.jvn.jp/jvndb/JVNDB-2015-000073 Advisory
    Changed Reference Type http://jvn.jp/en/jp/JVN06120222/index.html No Types Assigned http://jvn.jp/en/jp/JVN06120222/index.html Advisory
    Added CWE CWE-20
  • Initial Analysis by [email protected]

    Jun. 05, 2015

    Action Type Old Value New Value
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2015-2951 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2015-2951 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-23: File Content Injection File Content Injection CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies Accessing/Intercepting/Modifying HTTP Cookies CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-63: Cross-Site Scripting (XSS) Cross-Site Scripting (XSS) CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-73: User-Controlled Filename User-Controlled Filename CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-81: Web Server Logs Tampering Web Server Logs Tampering CAPEC-83: XPath Injection XPath Injection CAPEC-85: AJAX Footprinting AJAX Footprinting CAPEC-88: OS Command Injection OS Command Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-109: Object Relational Mapping Injection Object Relational Mapping Injection CAPEC-110: SQL Injection through SOAP Parameter Tampering SQL Injection through SOAP Parameter Tampering CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-136: LDAP Injection LDAP Injection CAPEC-153: Input Data Manipulation Input Data Manipulation CAPEC-182: Flash Injection Flash Injection CAPEC-209: XSS Using MIME Type Mismatch XSS Using MIME Type Mismatch CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads CAPEC-250: XML Injection XML Injection CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data Fuzzing for garnering other adjacent user/sensitive data CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-473: Signature Spoof Signature Spoof CAPEC-588: DOM-Based XSS DOM-Based XSS CAPEC-664: Server Side Request Forgery Server Side Request Forgery
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

1.78 }} -0.33%

score

0.81038

percentile

CVSS2 - Vulnerability Scoring System
Access Vector
Access Complexity
Authentication
Confidentiality
Integrity
Availability
:
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Latest DB Update: Apr. 29, 2025 2:15