MediumPublic exploit

AppFirewall Content-Type Bypass in Citrix NetScaler 10.5

IdentifiersCVE-2015-2841CWE-693

A vulnerability in Citrix NetScaler AppFirewall (version 10.5) allows remote attackers to bypass firewall restrictions by sending HTTP requests with specially crafted Content-Type headers, such as 'application/octet-stream' or 'text/xml'. The AppFirewall fails to properly enforce security policies for these Content-Types, enabling attackers to evade inspection and filtering mechanisms.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Attackers can bypass security controls enforced by the AppFirewall, potentially allowing malicious payloads or requests to reach protected backend applications. This could lead to further exploitation, data exfiltration, or compromise of backend systems that rely on the firewall for protection.

Mitigation

If you can’t patch tonight, do this now.

As an interim measure, implement custom rules or signatures to detect and block suspicious Content-Type headers (such as 'application/octet-stream' and 'text/xml') at the firewall or web application layer. Monitor logs for anomalous Content-Type usage and restrict allowed Content-Types to only those required by the application.

Remediation

Patch, then assume compromise.

Upgrade to a fixed version of Citrix NetScaler where this vulnerability is addressed. Apply any vendor-provided patches or updates that correct the improper handling of Content-Type headers in AppFirewall.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Citrix SystemsNetscalerapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

No public activity tracked yet. Mallory keeps watching.

0 SOURCESView more in app

No public activity observed for this vulnerability.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity