CVE-2021-39275
9.8 CRITICALap_escape_quotes() may write beyond the end of a buffer when given malicious input
Published: 2021-09-16 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 9.8 CRITICAL
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-787
Affected products
| Vendor | Product |
|---|---|
| apache | cloud_backup, clustered_data_ontap, debian_linux |
| debian | cloud_backup, clustered_data_ontap, debian_linux |
| fedoraproject | cloud_backup, clustered_data_ontap, debian_linux |
| netapp | cloud_backup, clustered_data_ontap, debian_linux |
| oracle | cloud_backup, clustered_data_ontap, debian_linux |
| siemens | cloud_backup, clustered_data_ontap, debian_linux |
Description
ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-39275
- [Other]https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- [Vendor advisory]https://httpd.apache.org/security/vulnerabilities_24.html
- [Patch]https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
- [Patch]https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
- [Patch]https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
- [Patch]https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
- [Other]https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- [Other]https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- [Other]https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- [Other]https://security.gentoo.org/glsa/202208-20
- [Other]https://security.netapp.com/advisory/ntap-20211008-0004/
- [Other]https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- [Other]https://www.debian.org/security/2021/dsa-4982
- [Patch]https://www.oracle.com/security-alerts/cpuapr2022.html
- [Patch]https://www.oracle.com/security-alerts/cpujan2022.html
- [Other]https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- [Vendor advisory]https://httpd.apache.org/security/vulnerabilities_24.html
- [Patch]https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
- [Patch]https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
- [Patch]https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
- [Patch]https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
- [Other]https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- [Other]https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- [Other]https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- [Other]https://security.gentoo.org/glsa/202208-20
- [Other]https://security.netapp.com/advisory/ntap-20211008-0004/
- [Other]https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- [Other]https://www.debian.org/security/2021/dsa-4982
- [Patch]https://www.oracle.com/security-alerts/cpuapr2022.html
- [Patch]https://www.oracle.com/security-alerts/cpujan2022.html
Related CVEs
Same vendor
- CVE-2026-50645 — There is no restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF, which can l... (7.5 HIGH)
- CVE-2026-50634 — A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadata that was not authenticate... (6.5 MEDIUM)
- CVE-2026-50633 — A JNDI Injection vulnerability has been discovered in Apache CXF's JCA integration module, which can allow for code execution, if an atta... (8.1 HIGH)
- CVE-2026-50632 — A further incomplete fix for a previous advisory CVE-2026-44417 (Untrusted JMS configuration can lead to RCE) for Apache CXF has been ide... (8.1 HIGH)
- CVE-2026-50631 — A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and ... (7.4 HIGH)
Same CWE
- CVE-2026-47750 — stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inf... (7.8 HIGH)
- CVE-2026-47747 — stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inf... (7.8 HIGH)
- CVE-2026-47749 — stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inf... (7.8 HIGH)
- CVE-2026-12314 — Memory safety bug fixed in Thunderbird 152 (7.5 HIGH)
- CVE-2026-12310 — Memory safety bug fixed in Thunderbird 152 (7.5 HIGH)