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No exploitation reportedFix available

CVE-2020-4042

No exploitation reported by the sources we read.

  • Published2020-07-10
  • WeaknessCWE-294

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-07-1020:15CVE publishedNVD

Versions per branch

NVD
Bareos
BranchAffectedFixed in
19.2≤ 19.2.7no fix published
19.2= 19.2.8no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • bareosUbuntu:16.04:LTSall versions · no fixed version listed
  • bareosCleanStartall versions · fixed in 19.2.8-r0
  • bareosAlpine:v3.24all versions · fixed in 19.2.8-r0
  • bareosAlpine:v3.23all versions · fixed in 19.2.8-r0
  • bareosAlpine:v3.22all versions · fixed in 19.2.8-r0
  • bareosAlpine:v3.21all versions · fixed in 19.2.8-r0
  • bareosAlpine:v3.20all versions · fixed in 19.2.8-r0
  • bareosAlpine:v3.19all versions · fixed in 19.2.8-r0

6 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.16.8known since 2026-10-23
  • NVDCVSS 3.16.8read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-294known since 2026-10-23
  • NVDweakness (CWE)CWE-294read 2026-10-23
  • FIRST EPSSEPSS score1.0 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Published
2020-07-10
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-4042?

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.

Is CVE-2020-4042 actively exploited?

Active exploitation of CVE-2020-4042 has not been confirmed. Its EPSS score was 1.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-4042?

CVE-2020-4042 has a CVSS v3 base score of 6.8 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N.

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