GNS3 ubridge through 0.9.18 on macOS, as used in GNS3 server before 2.1.17, allows a local attacker to read arbitrary files because it hand…

published 2020-06-23 6y ago modified 2026-06-17 4mo ago also EUVD-2020-7106

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits: 0; none known

GNS3 ubridge through 0.9.18 on macOS, as used in GNS3 server before 2.1.17, allows a local attacker to read arbitrary files because it handles configuration-file errors by printing the configuration file while executing in a setuid root context.

Patch / fix

links 2

github.com/GNS3/ubridge@2eb0d1d commit
github.com/GNS3/gns3-server/releases/tag/v2.1.17 release

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Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

theevilbit.github.io https://theevilbit.github.io/posts/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.9	AV:L/AC:L/Au:N/C:C/I:N/A:N

Classification

Weakness

CWE-269 Improper Privilege Management

References

github.com /GNS3/ubridge/commit/2eb0d1dab6a6de76cf3556130a2d52af101077db
patch, third-party-advisory
theevilbit.github.io /posts/
exploit, third-party-advisory
gns3.com /
vendor-advisory
github.com /GNS3/gns3-server/releases/tag/v2.1.17
release-notes, third-party-advisory

Sources

CVE List CVE-2020-14976
NVD CVE-2020-14976

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