supybot-fedora implements the command 'refresh', that refreshes the cache of all users from FAS.

published 2022-10-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7834

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

supybot-fedora implements the command 'refresh', that refreshes the cache of all users from FAS. This takes quite a while to run, and zodbot stops responding to requests during this time.

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-2020-15853 updated 2025-11-21

supybot-fedora: anyone can run the "refresh" command

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

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 17 mo ago (2025-05-13)

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

n/a supybot-fedora

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

github.com /fedora-infra/supybot-fedora/issues/69
issue-tracking, third-party-advisory

Sources

CVE List CVE-2020-15853
NVD CVE-2020-15853

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.

Summary