CVE-2019-12779

Exp

libqb before 1.0.5 allows local users to overwrite arbitrary files via a symlink attack, because it uses predictable filenames (under /dev/shm and /tmp) without O_EXCL.

Published: 2019-06-07 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-12779 is rated High Exploit Risk (60.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.66%). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2019-12779

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-12779

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 2026-06-15 0.03% 0.66% +0.62%
2 2025-03-30 0.05% 0.03% -0.02%
3 2025-03-29 — 0.05% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-12779

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.1 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L)
A normal user session is enough; they don’t have to be admin.
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:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.2 [email protected]
6.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:N/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
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:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 9.2 [email protected]

Weakness enumeration for CVE-2019-12779

OS Trackers for CVE-2019-12779

vendor priority summary link
debian unimportant CVE-2019-12779 unimportant priority: Debian including 1 source packages (libqb), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-12779
gentoo high CVE-2019-12779: 1 GLSA(s) (202107-03), 1 atom(s) (sys-cluster/libqb); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-12779
redhat medium — https://access.redhat.com/security/cve/CVE-2019-12779
suse medium — https://www.suse.com/security/cve/CVE-2019-12779/
ubuntu low CVE-2019-12779 low priority: Ubuntu including 1 source packages (libqb), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 13, needed 3, ignored 2, released 1. https://ubuntu.com/security/CVE-2019-12779

Affected software / configurations for CVE-2019-12779

Vendor Product Version Raw CPE
clusterlabs libqb < 1.0.5 cpe:2.3:a:clusterlabs:libqb:*:*:*:*:*:*:*:*

References for CVE-2019-12779

cvelogic Threat Intelligence