CVE-2019-10097

CVE-2019-10097 is a high-severity vulnerability in Apache Http Server with a CVSS 3.x base score of 7.2. Its EPSS exploit-prediction score of 53% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-476.

Key facts

• Severity: High (CVSS 3.x base score 7.2)
• CVSS v2: 6.0
• EPSS exploit prediction: 53% (99th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-476
• Affected product: Apache Http Server
• Published: 2019-09-26
• Last modified: 2026-06-17

Description

In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip was configured to use a trusted intermediary proxy server using the "PROXY" protocol, a specially crafted PROXY header could trigger a stack buffer overflow or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by untrusted HTTP clients.

Frequently asked questions

What is CVE-2019-10097?

In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip was configured to use a trusted intermediary proxy server using the "PROXY" protocol, a specially crafted PROXY header could trigger a stack buffer overflow or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by untrusted HTTP clients.

How severe is CVE-2019-10097?

CVE-2019-10097 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-10097 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 53% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-10097?

CVE-2019-10097 primarily affects Apache Http Server. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-10097?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-10097 published?

CVE-2019-10097 was published on 2019-09-26 and last updated on 2026-06-17.

References

• https://access.redhat.com/errata/RHSA-2019:4126
• https://httpd.apache.org/security/vulnerabilities_24.html
• https://lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E
• https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
• https://www.oracle.com/security-alerts/cpuapr2020.html
• https://www.oracle.com/security-alerts/cpujul2020.html
• https://www.oracle.com/security-alerts/cpuoct2020.html
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Affected products (20)

• cpe:2.3:a:apache:http_server:2.4.33:*:*:*:*:*:*:*
• cpe:2.3:a:apache:http_server:2.4.34:*:*:*:*:*:*:*
• cpe:2.3:a:apache:http_server:2.4.35:*:*:*:*:*:*:*
• cpe:2.3:a:apache:http_server:2.4.37:*:*:*:*:*:*:*
• cpe:2.3:a:apache:http_server:2.4.38:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_element_manager:8.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_element_manager:8.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_element_manager:8.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_element_manager:8.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_session_report_manager:8.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_session_report_manager:8.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_session_report_manager:8.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_session_route_manager:8.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_session_route_manager:8.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_session_route_manager:8.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_xstore_point_of_service:7.1:*:*:*:*:*:*:*

More vulnerabilities in Apache Http Server

• CVE-2010-0425 — Critical (CVSS 10.0): modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and…
• CVE-2005-2700 — Critical (CVSS 10.0): ssl_engine_kernel.c in mod_ssl before 2.8.24, when using "SSLVerifyClient optional" in the global virtual host…
• CVE-2004-0492 — Critical (CVSS 10.0): Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a…
• CVE-2003-0789 — Critical (CVSS 10.0): mod_cgid in Apache before 2.0.48, when using a threaded MPM, does not properly handle CGI redirect paths, which could…
• CVE-1999-1293 — Critical (CVSS 10.0): mod_proxy in Apache 1.2.5 and earlier allows remote attackers to cause a denial of service via malformed FTP commands,…
• CVE-1999-0926 — Critical (CVSS 10.0): Apache allows remote attackers to conduct a denial of service via a large number of MIME headers.

All CVEs affecting Apache Http Server →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

• CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
• CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
• CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
• CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
• CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
• CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 50.255.62.89 (ipv4-addr)
• 218.51.148.194 (ipv4-addr)
• 197.44.15.210 (ipv4-addr)
• 187.216.224.85 (ipv4-addr)
• 101.100.194.252 (ipv4-addr)
• 20.153.204.5 (ipv4-addr)
• 193.30.14.161 (ipv4-addr)
• 171.100.121.127 (ipv4-addr)