CVE-2017-18349Fastjson Vulnerability
Improper Input Validation in alilibaba:fastjson
Published Oct 24, 2018 · Updated Jul 8, 2026 · Also known as GHSA-xjrr-xv9m-4pw5
Key Facts
Patch immediately- CVE-2017-18349 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Fastjson (Alibaba), Pippo, com.alibaba:fastjson (maven) and 1 more product.
- It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 23, 2018. No public exploit code is known.
- EPSS estimates a 39% probability of exploitation in the next 30 days.
- Fixed versions are available, including Fastjson 1.2.25, com.alibaba:fastjson 1.2.31, ro.pippo:pippo-fastjson 1.12.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
39%
Higher than 98.5% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
46/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 23, 2018
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
10
Reports of active use
Advisories And Exploit References
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | Oct 23, 2018 | n/a | Not reported |
| Industry KEV feed | Oct 23, 2018 | n/a | Not reported |
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FastjsonAlibaba | See advisory | 1.2.25 |
| PippoPippo | 1.11.0 | n/a |
| com.alibaba:fastjsonmaven | See advisory | 1.2.31 |
| ro.pippo:pippo-fastjsonmaven | See advisory | 1.12.0 |
Patched Releases
Fastjson
1.2.25
com.alibaba:fastjson
1.2.31
ro.pippo:pippo-fastjson
1.12.0
Timeline
Added to CIRCL KEV
Oct 23, 2018
Added to Industry KEV feed
Oct 23, 2018
Publicly disclosed
Oct 24, 2018
Last updated
Jul 8, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- advisorynvd.nist.gov · CVE-2017-18349
- advisoryfortiguard.com · 44059
- advisoryGHSA advisory
- advisorygithub.com · security_update_20170315
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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 AjaxApp…
Affected: Fastjson (Alibaba); Pippo versions 1.11.0; com.alibaba:fastjson (maven), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Oct 23, 2018.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Fastjson 1.2.25, com.alibaba:fastjson 1.2.31, ro.pippo:pippo-fastjson 1.12.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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