CVE-2020-4042 json
Authentication bypass in Bareos
published 2020-07-10 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-25302
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
Bareos before version 19.2.8 and earlier allows a malicious client to communicate with the director without knowledge of the shared secret if the director allows client initiated connection and connects to the client itself. The malicious client can replay the Bareos director's cram-md5 challenge to the director itself leading to the director responding to the replayed challenge. The response obtained is then a valid reply to the directors original challenge. This is fixed in version 19.2.8.
Patch / fix
- bareos Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 19.2.8-r0
alpine advisories ALPINE-CVE-2020-4042
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Exploit prediction
0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N |
| NVD | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- bareos bareos
Classification
- Weakness
-
- CWE-294 Authentication Bypass by Capture-replay
References
-
bugs.bareos.org
/view.php?id=1250
vendor-advisory
-
github.com
/bareos/bareos/security/advisories/GHSA-vqpj-2vhj-h752
mitigation, third-party-advisory
Sources
- CVE List CVE-2020-4042
- NVD CVE-2020-4042
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.