NULL pointer dereference in Apache Http_server
CVE-2021-41524
While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduc…
EPSS: 0.250 (97.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Apache Http_server — versions 2.4.49
- Apache Software Foundation Http Server — versions 2.4.49
- Netapp Cloud_backup
- Oracle Instantis_enterprisetrack — versions 17.1, 17.2, 17.3
- Fedoraproject Fedora — versions 34, 35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (x_refsource_MISC, Vendor Advisory)
- security@apache.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@apache.org (x_refsource_FEDORA, vendor-advisory)
- security@apache.org (x_refsource_CISCO, vendor-advisory, Third Party Advisory)
- security@apache.org (x_refsource_FEDORA, vendor-advisory)
- security@apache.org (Patch, Third Party Advisory, x_refsource_MISC)
- security@apache.org (x_refsource_CONFIRM, Third Party Advisory)
- security@apache.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2021-41524?
- CVE-2021-41524 is a high-severity vulnerability in Apache Http_server, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-10-05.
- How severe is CVE-2021-41524?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-41524 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.