7.5

CVE-2021-23192: samba Improper Input Validation

Modified
AliasesALPINE-CVE-2021-23192UBUNTU-CVE-2021-23192DEBIAN-CVE-2021-23192
Published 02-03-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-23192 is a high (CVSS 7.5) Improper Input Validation vulnerability in samba. EPSS estimates a 1.95% chance of exploitation in the next 30 days, higher than 80.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.95%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 9
DSA-5003-1MGASA-2021-0585OPENSUSE-SU-2021:1471-1OPENSUSE-SU-2021:3647-1OPENSUSE-SU-2021:3650-1OPENSUSE-SU-2024:11631-1

Timeline

  1. 02-03-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.95%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.95% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • samba≥ 4.10.0, < 4.13.17-r0 | ≥ 4.10.0, < 4.14.12-r0 | ≥ 4.10.0, < 4.15.2-r0
Debian1 product
  • samba< 2:4.13.14+dfsg-1
Samba1 product
  • samba≥ 4.10.0, < 4.13.14 | ≥ 4.14.0, < 4.14.10 | ≥ 4.15.0, < 4.15.2
Ubuntu1 product
  • samba< 2:4.13.14+dfsg-0ubuntu0.20.04.1 | < 2:4.13.14+dfsg-0ubuntu1

4 vendors · 4 products

References

10 links