CVE-2021-45105
This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 100.0%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 100.00% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-674
- Affected
- apache/log4j · netapp/cloud manager · debian/debian linux · sonicwall/email security · sonicwall/network security manager · sonicwall/web application firewall · sonicwall/6bk1602-0aa12-0tp0 firmware · sonicwall/6bk1602-0aa22-0tp0 firmware · sonicwall/6bk1602-0aa32-0tp0 firmware · sonicwall/6bk1602-0aa42-0tp0 firmware · sonicwall/6bk1602-0aa52-0tp0 firmware · oracle/agile engineering data management · oracle/agile plm mcad connector · oracle/agile product lifecycle management · oracle/autovue for agile product lifecycle management · oracle/banking deposits and lines of credit servicing · oracle/banking enterprise default management · oracle/banking loans servicing · oracle/banking party management · oracle/banking payments · +40 more
- Source
- security@apache.org
EPSS 100.0% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2021/12/19/1Mailing List, Mitigation, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdfThird Party Advisory
- https://logging.apache.org/log4j/2.x/security.htmlRelease Notes, Vendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211218-0001/Third Party Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdThird Party Advisory
- https://www.debian.org/security/2021/dsa-5024Third Party Advisory
- https://www.kb.cert.org/vuls/id/930724Third Party Advisory, US Government Resource
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-1541/Third Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2021/12/19/1Mailing List, Mitigation, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdfThird Party Advisory
- https://logging.apache.org/log4j/2.x/security.htmlRelease Notes, Vendor Advisory
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211218-0001/Third Party Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdThird Party Advisory
- https://www.debian.org/security/2021/dsa-5024Third Party Advisory
- https://www.kb.cert.org/vuls/id/930724Third Party Advisory, US Government Resource
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-1541/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.