CVE-2022-28129 in Traffic Server
Summary
by MITRE • 08/10/2022
Improper Input Validation vulnerability in HTTP/1.1 header parsing of Apache Traffic Server allows an attacker to send invalid headers. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.
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Analysis
by VulDB Data Team • 05/16/2026
The CVE-2022-28129 vulnerability represents a critical improper input validation flaw within the HTTP/1.1 header parsing mechanism of Apache Traffic Server. This weakness specifically manifests during the processing of malformed or invalid HTTP headers, creating potential entry points for malicious actors to exploit the system. The vulnerability affects a substantial range of Apache Traffic Server versions from 8.0.0 through 9.1.2, indicating a prolonged period during which systems could be exposed to this security risk. The flaw resides in how the traffic server handles header validation, particularly when processing headers that do not conform to standard HTTP/1.1 specifications.
The technical nature of this vulnerability stems from insufficient validation of HTTP header content during the parsing process, allowing attackers to craft malformed headers that may trigger unexpected behavior in the server implementation. This improper input validation creates opportunities for various attack vectors including but not limited to header injection attacks, where maliciously crafted headers could be processed in unintended ways. The vulnerability operates at the protocol level, specifically targeting the HTTP/1.1 header parsing functionality that is fundamental to web server operations. According to CWE classification, this maps to CWE-20, which represents "Improper Input Validation" and is a well-documented weakness that frequently leads to serious security consequences including denial of service, information disclosure, and potentially remote code execution depending on the broader system context.
From an operational impact perspective, this vulnerability could enable attackers to disrupt service availability through carefully crafted header inputs that cause the traffic server to behave unpredictably. The potential for denial of service attacks is significant as malformed headers could cause the server to crash or become unresponsive, effectively preventing legitimate users from accessing services. Additionally, the vulnerability may allow for information leakage if the improper header handling reveals internal system information or configuration details. The attack surface is particularly concerning given that Apache Traffic Server serves as a critical component in many web infrastructure deployments, making this vulnerability potentially widespread across organizations that rely on traffic server for content delivery and caching services.
Organizations should prioritize immediate remediation by upgrading to Apache Traffic Server versions that have addressed this vulnerability, typically those beyond 9.1.2. The mitigation strategy should include implementing robust input validation at multiple layers of the network stack, including application-level header validation and network filtering to prevent malformed headers from reaching the traffic server. Security monitoring should be enhanced to detect unusual header patterns that may indicate exploitation attempts. Network segmentation and access controls should be reviewed to limit exposure of traffic server instances to untrusted networks. The implementation of web application firewalls and intrusion detection systems can provide additional protection layers against header-based attacks. This vulnerability highlights the importance of maintaining up-to-date security practices and the necessity of comprehensive testing of input validation mechanisms, particularly in critical infrastructure components like traffic servers that handle high volumes of HTTP traffic.