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CVE-2025-53643VulnerabilityPublished Updated

Red Hat Security Advisory: Satellite 6.18.3 Async Update

Affects Red Hat vdirsyncerSource GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2025-53643· Low 1.7

Not known to be exploited · CVSS 1.7 Low · fixed in Red Hat package updates : update Red Hat vdirsyncer when convenient.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 4.0 base score
1.7Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.19.3_4, 1.16.43
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Jul 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade vdirsyncer to 0.19.3_4; bzt to 1.16.43.

Affected software

ProductAffectedFixed in
Homebrewvdirsyncerpkg:brew/vdirsyncerOther threatsAffected
  • >=0.19.0 <0.19.3_4
Fixed in
  • 0.19.3_4
Homebrewbztpkg:brew/bztOther threatsAffected
  • >=1.16.2 <1.16.43
Fixed in
  • 1.16.43

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

Red Hat Satellite is a system management solution that allows organizations to configure and maintain their systems without the necessity to provide public Internet access to their servers or other client systems. It performs provisioning and configuration management of predefined standard operating environments. Security Fix(es): * python-aiohttp: AIOHTTP HTTP Request/Response Smuggling (CVE-2025-53643) * python3.12-urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) (CVE-2026-21441) * python3.12-urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

References

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