How severe is CVE-2017-18349?

CVE-2017-18349 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2017-18349?

CVE-2017-18349 affects the following packages: com.alibaba:fastjson (Maven), ro.pippo:pippo-fastjson (Maven). Ecosystems affected: Maven.

How do I fix CVE-2017-18349?

Update com.alibaba:fastjson to version 1.2.31 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is CVE-2017-18349 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2017-18349, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2017-18349?

CVE-2017-18349 has an EPSS (Exploit Prediction Scoring System) score of 90.7%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2017-18349?

CVE-2017-18349 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for CVE-2017-18349?

A Nuclei detection template exists for CVE-2017-18349, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2017-18349 published, and has it been updated?

CVE-2017-18349 was published on October 23, 2018 and was last updated on April 11, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

CVE-2017-18349

CRITICAL

Improper Input Validation in alilibaba:fastjson

Also known asGHSA-xjrr-xv9m-4pw5

Published

Oct 23, 2018

Updated

Apr 11, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

90.7%probability of exploitation in next 30 days

Very High Risk100th percentile+2.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

2 pkgs affected

☕com.alibaba:fastjson☕ro.pippo:pippo-fastjson

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pippo 1.11.0 and other products, allows remote attackers to execute arbitrary code via a crafted JSON request, as demonstrated by a crafted rmi:// URI in the dataSourceName field of HTTP POST data to the Pippo /json URI, which is mishandled in AjaxApplication.java.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.alibaba:fastjson`	all versions	1.2.31
☕Maven	`ro.pippo:pippo-fastjson`	all versions	1.12.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pipp…

github.comNVDJan 2019

parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pipp…

github.comGithubApr 2022

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2017-18349 in your stack?

O3 detects CVE-2017-18349 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works