`CVE-2017-18349`

Affected software	2 products, listed below
Severity	9.8 Critical CVSS 3.0 2 scores
Fixed in	`1.2.31`
Weakness	Improper input validation (CWE-20)
Published	23 Oct 2018
Updated	17 Jun 2026

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.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

CISA KEV not listed
VulnCheck KEV listed Exploitation reported in the wild. Honeypot sightings · 1 exploit · earliest 2024-01-22.
CISA Vulnrichment no assessment published
Indexed PoC 3 indexed Published artifacts you can open, in GitHub PoC, Nuclei; first seen 2022-04-14.
EPSS 39% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2017-18349 in VulnCheck (free account).

Evidence	Source	Detail	Date
Honeypot sighting	Shadowserver honeypots	Exploitation attempts seen on 510 days	2024-01-22 to 2026-11-12
Exploit reference	VulnCheck XDB 7d04de7f32b1	Exploit type: initial-access	2026-11-05

Evidence

Source

Detail

Date

Honeypot sighting

Shadowserver honeypots

Exploitation attempts seen on 510 days

2024-01-22 to 2026-11-12

Exploit reference

VulnCheck XDB 7d04de7f32b1

Exploit type: initial-access

2026-11-05

2 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	h0cksr/Fastjson--CVE-2017-18349-	2	2022-04-14
GitHub PoC	CVE-2017-18349漏洞环境与PoC		2026-11-05
Nuclei	Fastjson Insecure Deserialization - Remote Code Execution

Index

Artifact

Stars

First seen

GitHub PoC

h0cksr/Fastjson--CVE-2017-18349-

2022-04-14

GitHub PoC

CVE-2017-18349漏洞环境与PoC

2026-11-05

Nuclei

Fastjson Insecure Deserialization - Remote Code Execution

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review automated Upstream data
Record active

Decided by	An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead
Finding	Every Maven package this CVE affects (com.alibaba:fastjson, ro.pippo:pippo-fastjson) is on the excluded_maven_packages list in known-products.yaml, so it is not reviewed.

Decided by

An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

Finding

Every Maven package this CVE affects (com.alibaba:fastjson, ro.pippo:pippo-fastjson) is on the excluded_maven_packages list in known-products.yaml, so it is not reviewed.

CVSS

9.8 CRITICAL v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H NVD Primary published

CVSS 2.0 10.0 none AV:N/AC:L/Au:N/C:C/I:C/A:C NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.0	9.8	CRITICAL	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`	NVD	Primary	published
CVSS 2.0	10.0	none	`AV:N/AC:L/Au:N/C:C/I:C/A:C`	NVD	Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

com.alibaba:fastjson 0 1.2.31 unbounded

ro.pippo:pippo-fastjson 0 1.12.0 unbounded

Package	Introduced	Fixed	Last affected
`com.alibaba:fastjson`	0	`1.2.31`	unbounded
`ro.pippo:pippo-fastjson`	0	`1.12.0`	unbounded

Products and versions

4 products, 4 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	alibaba	fastjson	generic	＜ 1.2.25
osv	com.alibaba	fastjson	generic	＜ 1.2.31
nvd	pippo	pippo	generic	1.11.0
osv	ro.pippo	pippo-fastjson	generic	＜ 1.12.0

Source

Vendor

Product

Scheme

Affected versions

nvd

alibaba

fastjson

generic

＜ 1.2.25

osv

com.alibaba

fastjson

generic

＜ 1.2.31

nvd

pippo

generic

1.11.0

osv

ro.pippo

pippo-fastjson

generic

＜ 1.12.0

References

URL	Tags
https://github.com/pippo-java/pippo/issues/466	WEB
https://github.com/pippo-java/pippo/commit/8443377d3c5b35acca190a66894b4f95e4051be2	WEB
https://fortiguard.com/encyclopedia/ips/44059	WEB
https://github.com/advisories/GHSA-xjrr-xv9m-4pw5	ADVISORY
https://github.com/alibaba/fastjson	PACKAGE
https://github.com/alibaba/fastjson/wiki/security_update_20170315	WEB

URL

Timeline

Published	2018-10-23	By the CVE Program.
VulnCheck KEV: earliest evidence	2024-01-22	Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.
VulnCheck KEV: latest evidence	2026-11-12	Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.

Published

2018-10-23

By the CVE Program.

VulnCheck KEV: earliest evidence

2024-01-22

Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

VulnCheck KEV: latest evidence

2026-11-12

Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.

How VRT decided (9 of 24 rules ran)

9 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven decided it matched Outside Waratek scope Maven packages excluded by policy: com.alibaba:fastjson, ro.pippo:pippo-fastjson

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

alibaba fastjson not tracked cpe:2.3:a:alibaba:fastjson:*:*:*:*:*:*:*:*

pippo pippo not tracked cpe:2.3:a:pippo:pippo:1.11.0:*:*:*:*:*:*:*

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