CVE-2017-18349: parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pippo 1.11.0 and other products, allows re

This week

CRITICAL 9.8REMOTEUPGRADEDOWNGRADE

CVE-2017-18349 is a critical-severity flaw (CVSS 9.8) affecting fastjson, pippo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	38.8% (top 1%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-10-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: alibaba · pippo

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-23 20:29 UTCPublished CVE record published
2026-06-17 01:12 UTCUpdated Record last modified

alibaba fastjson UPGRADE

Affected: < 1.2.25

Fixed in: 1.2.25

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fastjson || rpm -q fastjson || fastjson --version

2. UPGRADE to 1.2.25 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fastjson

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fastjson

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

pippo pippo DOWNGRADE

Affected: 1.11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.11.0

1. Check installed version

apt-cache policy pippo || rpm -q pippo || pippo --version

2. No fixed release: DOWNGRADE to a release before 1.11.0 (Debian / Ubuntu)

apt-cache madison pippo sudo apt install pippo=<VERSION_BEFORE_1.11.0> sudo apt-mark hold pippo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pippo sudo dnf downgrade pippo-<VERSION_BEFORE_1.11.0> sudo dnf versionlock add pippo

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Fastjson Insecure Deserialization - Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-18349?

fastjson: upgrade to 1.2.25; pippo: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-18349 being exploited?

CVE-2017-18349 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-18349 affect?

CVE-2017-18349 affects fastjson, pippo. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2017-18349?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2022-25845 HIGH 8.1 UPGRADE DOWNGRADE The package com.alibaba:fastjson before 1.2.83 are vulnerable to Deserialization of Untrusted Data by bypassin

References

← Back to latest CVEs