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CVE-2016-4303

34
FAUCET Score

CVE-2016-4303 is a critical heap-based buffer overflow vulnerability in the cJSON library's parse_string function, affecting products like Debian, Novell, and openSUSE. An unauthenticated remote attacker can exploit this by sending a specially crafted JSON string containing a non-hex character, leading to a denial of service or arbitrary code execution. With a CVSS score of 9.8, this vulnerability is highly severe due to its network-based attack vector and high impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0, < 3.0.12CPE matchmatch criteria
cpe:2.3:a:es:iperf3:*:*:*:*:*:*:*:*
>= 3.1, < 3.1.3CPE matchmatch criteria
cpe:2.3:a:es:iperf3:*:*:*:*:*:*:*:*
12CPE matchmatch criteria
cpe:2.3:a:novell:suse_package_hub_for_suse_linux_enterprise:12:*:*:*:*:*:*:*
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.96%
Probability of exploitation in next 30 days
EPSS Percentile
93.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0696 is in the 88th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

blog.talosintel.com / 2016/06/esnet-vulnerability.html
ExploitThird Party Advisory
lists.opensuse.org / opensuse-updates/2016-08/msg00082.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-updates/2016-08/msg00090.html
Mailing ListThird Party Advisory
github.com / esnet/iperf/commit/91f2fa59e8ed80dfbf400add0164ee0e508e412a
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2020/01/msg00023.html
Mailing ListThird Party Advisory
software.es.net / iperf/news.html
Release NotesThird Party Advisory
raw.githubusercontent.com / esnet/security/master/cve-2016-4303/esnet-secadv-2016-0001.txt.asc
Third Party Advisory
talosintelligence.com / reports/TALOS-2016-0164
ExploitThird Party Advisory