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CVE-2017-9802

MEDIUM

CVE-2017-9802 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in apache sling servlets post. O3 Security detects and blocks CVE-2017-9802 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

The Javascript method Sling.evalString() in Apache Sling Servlets Post before 2.3.22 uses the javascript 'eval' function to parse input strings, which allows for XSS attacks by passing…

Published
Aug 14, 2017
Updated
Jun 17, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

Description

The Javascript method Sling.evalString() in Apache Sling Servlets Post before 2.3.22 uses the javascript 'eval' function to parse input strings, which allows for XSS attacks by passing specially crafted input strings.

Affected Products

1 product · 1 configurations
Application
sling servlets postapache
≤ 2.3.20
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every apache sling servlets post deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Remediation status

    No patch has shipped for CVE-2017-9802 yet — track the apache sling servlets post advisory for a fixed release and apply the workarounds below in the meantime.

  3. Mitigate without a patch

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2017-9802 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2017-9802. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

The Javascript method Sling.evalString() in Apache Sling Servlets Post before 2.3.22 uses the javascript 'eval' function to parse input strings, which allows for XSS attacks by passing specially crafted input strings.
O3 Security · Runtime Protection

Is CVE-2017-9802 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2017-9802 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.