CVE-2016-9956

The route manager in FlightGear before 2016.4.4 allows remote attackers to write to arbitrary files via a crafted Nasal script.

Published: 2017-02-22 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-9956 is rated Moderate Risk (58.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.89%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-9956

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 2.17% 1.89% -0.28%
2 2025-03-29 1.89% 2.17% +0.28%
3 2025-03-17 — 1.89% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-9956

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2016-9956

OS Trackers for CVE-2016-9956

vendor priority summary link
debian not yet assigned CVE-2016-9956 not yet assigned priority: Debian including 1 source packages (flightgear), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-9956
ubuntu medium CVE-2016-9956 medium priority: Ubuntu including 1 source packages (flightgear), 12 status rows across 12 suites (artful, bionic, cosmic, disco, eoan, focal, precise, trusty, upstream, xenial, yakkety, zesty): not-affected 7, ignored 2, released 2, DNE 1. https://ubuntu.com/security/CVE-2016-9956

Affected software / configurations for CVE-2016-9956

Vendor Product Version Raw CPE
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
fedoraproject fedora 24 cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
fedoraproject fedora 25 cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*
flightgear flightgear <= 2016.4.3 cpe:2.3:a:flightgear:flightgear:*:*:*:*:*:*:*:*

References for CVE-2016-9956

URL Tags
http://www.debian.org/security/2016/dsa-3742 Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/14/11 Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/15/10 Mailing List Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/12/16/5 Mailing List Third Party Advisory
http://www.securityfocus.com/bid/94945 Third Party Advisory VDB Entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZKAN7V6UOHSRFWO567XMN4O6WXTSL32/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DB3B5XBB2NL2O2U4WNYGH7ZL45Q4UHGG/
https://sourceforge.net/p/flightgear/flightgear/ci/280cd523686fbdb175d50417266d2487a8ce67d2/ Issue Tracking Patch Third Party Advisory
https://sourceforge.net/projects/flightgear/files/release-2016.4/ Patch Release Notes Third Party Advisory
https://usn.ubuntu.com/4588-1/
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