Known vulnerabilities in Apache Log4j

Software: Apache Log4j
Software CPE: cpe:2.3:a:apache_foundation:log4j:*:*:*:*:*:*:*:*
Total vulnerabilities: 18
Public exploits: 2
Known exploited (KEV): 2
Highest CVSSv4 Score: 9.3

Breakdown by Severity Chart

Severity distribution of vulnerabilities affecting Apache Log4j Apache Log4j is affected by 18 known vulnerabilities: 1 critical, 5 high, 11 medium, 1 low Critical High Medium Low

Vulnerabilities (18)

Vulnerability CWE-ID CSH Severity Public Exploit KEV First fixed release Published Bulletins
#VU128403 - Improper Encoding or Escaping of Output
CVE-2026-34481
CWE-116 Medium
No
No
2.25.4 28.04.2026 SB20260428217
SB20260513128
SB2026052731
and 1 more
#VU128402 - Improper Encoding or Escaping of Output
CVE-2026-34480
CWE-116 Medium
No
No
2.25.4 28.04.2026 SB20260428217
SB20260513128
SB2026052632
and 20 more
#VU128401 - Improper Encoding or Escaping of Output
CVE-2026-34479
CWE-116 Medium
No
No
2.25.4 28.04.2026 SB20260428217
SB20260513128
SB2026052632
and 18 more
#VU128400 - Improper Output Neutralization for Logs
CVE-2026-34478
CWE-117 Medium
No
No
2.25.4 28.04.2026 SB20260428217
SB2026052632
SB2026052731
and 18 more
#VU128399 - Improper Certificate Validation
CVE-2026-34477
CWE-295 Medium
No
No
2.25.4 28.04.2026 SB20260428217
SB20260513128
SB2026052632
and 21 more
#VU120231 - Improper Validation of Certificate with Host Mismatch
CVE-2025-68161
CWE-297 Medium
No
No
2.25.3 22.12.2025 SB2025122245
SB2026012084
SB2026012087
and 101 more
#VU73244 - Resource exhaustion
CVE-2023-26464
CWE-400 Medium
No
No
2.0 10.03.2023 SB2023031040
SB2023032716
SB2023050514
and 22 more
#VU59693 - Deserialization of Untrusted Data
CVE-2020-9493
CWE-502 High
No
No
- 18.01.2022 SB2021061626
SB2022011819
SB2022012640
and 62 more
#VU59692 - Deserialization of Untrusted Data
CVE-2022-23302
CWE-502 High
No
No
- 18.01.2022 SB2022011818
SB2022012640
SB2022012641
and 60 more
#VU59691 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE-2022-23305
CWE-89 Medium
No
No
- 18.01.2022 SB2022011818
SB2022012640
SB2022012641
and 94 more
#VU59098 - Improper Control of Generation of Code ('Code Injection')
CVE-2021-44832
CWE-94 Medium
No
No
2.17.1 28.12.2021 SB2021122816
SB2021123002
SB2022010601
and 197 more
#VU59051 - Loop with Unreachable Exit Condition ('Infinite Loop')
CVE-2021-45105
CWE-835 Medium
Available
No
2.17.0 18.12.2021 SB2021121802
SB2021121903
SB2021122011
and 169 more
#VU58977 - Deserialization of Untrusted Data
CVE-2021-4104
CWE-502 Medium
No
No
2.16.0 15.12.2021 SB2021121507
SB2021121647
SB2021121720
and 119 more
#VU58976 - Improper Control of Generation of Code ('Code Injection')
CVE-2021-45046
CWE-94 High
Available
Exploited
2.16.0 15.12.2021 SB2021121504
SB2021121511
SB2021121512
and 178 more
#VU58816 - Improper Control of Generation of Code ('Code Injection')
CVE-2021-44228
CWE-94 Critical
Available
Exploited
2.15.0 10.12.2021 SB2021121003
SB2021121101
SB2021121201
and 338 more
#VU27960 - Deserialization of Untrusted Data
CVE-2019-17571
CWE-502 High
No
No
- 18.05.2020 SB2019122027
SB2020051806
SB2020011497
and 28 more
#VU27487 - Improper Certificate Validation
CVE-2020-9488
CWE-295 Low
No
No
2.13.2 04.05.2020 SB2020050406
SB2020071606
SB2020071620
and 67 more
#VU12127 - Deserialization of Untrusted Data
CVE-2017-5645
CWE-502 High
No
No
- 24.04.2018 SB2017040201
SB2019011707
SB2017090512
and 40 more