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Fencer Vulns
medium 4.6

CVE-2020-9759 json

webOS TV Emulator privilege escalation vulnerability

published 2020-03-23 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30538

cvss
4.6
version 3.1, CNA
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

Summary

A Vulnerability of LG Electronic web OS TV Emulator could allow an attacker to escalate privileges and overwrite certain files. This vulnerability is due to wrong environment setting. An attacker could exploit this vulnerability through crafted configuration files and executable files.

Patch / fix

  • weechat Debian 14, Debian 13, Debian 12 2.7.1-1

debian advisories DEBIAN-CVE-2020-9759

  • weechat Ubuntu Pro 16.04 LTS 1.4-2ubuntu0.1+esm1
  • weechat Ubuntu Pro 18.04 LTS 1.9.1-1ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2020-9759

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • weechat Arch Linux 2.7.1-1

arch linux advisories AVG-1103

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-9759 updated cvss 7.5

weechat: malformed message 352 (who) can cause a NULL pointer dereference in the callback function which could result in a crash.

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.recurity-labs.com https://blog.recurity-labs.com/2021-02-03/webOS_Pt1.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-494 Download of Code Without Integrity Check

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.