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Vulnerability record · CVE-2020-13956 · published 2 December 2020

CVE-2020-13956: Apache httpclient vulnerability

Apache · Httpclient

Apache HttpClient versions prior to version 4.5.13 and 5.0.3 can misinterpret malformed authority component in request URIs passed to the library as java.net.URI object and pick the wrong target host for request execution.

5.3 CVSS 3.1 Medium EPSS 9.0% · top 4.9%
5.3CVSS 3.1 base score, v2 5.0
9.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
127References
17 Jun 2026Last modified by NVD

Description

Apache HttpClient versions prior to version 4.5.13 and 5.0.3 can misinterpret malformed authority component in request URIs passed to the library as java.net.URI object and pick the wrong target host for request execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread.html/r03bbc318c81be21f5c8a9b85e34f2ecc741aa804a8e43b0ef2c37749%40%3Cissues.maven.apache.
https://lists.apache.org/thread.html/r043a75acdeb52b15dd5e9524cdadef4202e6a5228644206acf9363f9%40%3Cdev.hive.apache.org%
https://lists.apache.org/thread.html/r06cf3ca5c8ceb94b39cd24a73d4e96153b485a7dac88444dd876accb%40%3Cissues.drill.apache.
https://lists.apache.org/thread.html/r0a75b8f0f72f3e18442dc56d33f3827b905f2fe5b7ba48997436f5d1%40%3Cissues.solr.apache.o
https://lists.apache.org/thread.html/r0bebe6f9808ac7bdf572873b4fa96a29c6398c90dab29f131f3ebffe%40%3Cissues.solr.apache.o
https://lists.apache.org/thread.html/r12cb62751b35bdcda0ae2a08b67877d665a1f4d41eee0fa7367169e0%40%3Cdev.ranger.apache.or
https://lists.apache.org/thread.html/r132e4c6a560cfc519caa1aaee63bdd4036327610eadbd89f76dd5457%40%3Cdev.creadur.apache.o
https://lists.apache.org/thread.html/r2835543ef0f91adcc47da72389b816e36936f584c7be584d2314fac3%40%3Cissues.lucene.apache
https://lists.apache.org/thread.html/r2a03dc210231d7e852ef73015f71792ac0fcaca6cccc024c522ef17d%40%3Ccommits.creadur.apac
https://lists.apache.org/thread.html/r2dc7930b43eadc78220d269b79e13ecd387e4bee52db67b2f47d4303%40%3Cgitbox.hive.apache.o
https://lists.apache.org/thread.html/r34178ab6ef106bc940665fd3f4ba5026fac3603b3fa2aefafa0b619d%40%3Cdev.ranger.apache.or
https://lists.apache.org/thread.html/r34efec51cb817397ccf9f86e25a75676d435ba5f83ee7b2eabdad707%40%3Ccommits.creadur.apac
https://lists.apache.org/thread.html/r3cecd59fba74404cbf4eb430135e1080897fb376f111406a78bed13a%40%3Cissues.lucene.apache
https://lists.apache.org/thread.html/r3f740e4c38bba1face49078aa5cbeeb558c27be601cc9712ad2dcd1e%40%3Ccommits.creadur.apac
https://lists.apache.org/thread.html/r4850b3fbaea02fde2886e461005e4af8d37c80a48b3ce2a6edca0e30%40%3Cissues.solr.apache.o
https://lists.apache.org/thread.html/r549ac8c159bf0c568c19670bedeb8d7c0074beded951d34b1c1d0d05%40%3Cdev.drill.apache.org
https://lists.apache.org/thread.html/r55b2a1d1e9b1ec9db792b93da8f0f99a4fd5a5310b02673359d9b4d1%40%3Cdev.drill.apache.org
https://lists.apache.org/thread.html/r5b55f65c123a7481104d663a915ec45a0d103e6aaa03f42ed1c07a89%40%3Cdev.jackrabbit.apach
https://lists.apache.org/thread.html/r5de3d3808e7b5028df966e45115e006456c4e8931dc1e29036f17927%40%3Cissues.solr.apache.o
https://lists.apache.org/thread.html/r5fec9c1d67f928179adf484b01e7becd7c0a6fdfe3a08f92ea743b90%40%3Cissues.hive.apache.o
https://lists.apache.org/thread.html/r63296c45d5d84447babaf39bd1487329d8a80d8d563e67a4b6f3d8a7%40%3Cdev.ranger.apache.or
https://lists.apache.org/thread.html/r69a94e2f302d1b778bdfefe90fcb4b8c50b226438c3c8c1d0de85a19%40%3Cdev.ranger.apache.or
https://lists.apache.org/thread.html/r6a3cda38d050ebe13c1bc9a28d0a8ec38945095d07eca49046bcb89f%40%3Cissues.solr.apache.o
https://lists.apache.org/thread.html/r6d672b46622842e565e00f6ef6bef83eb55d8792aac2bee75bff9a2a%40%3Cissues.lucene.apache
https://lists.apache.org/thread.html/r6dab7da30f8bf075f79ee189e33b45a197502e2676481bb8787fc0d7%40%3Cdev.hc.apache.org%3E Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6eb2dae157dbc9af1f30d1f64e9c60d4ebef618f3dce4a0e32d6ea4d%40%3Ccommits.drill.apache
https://lists.apache.org/thread.html/r70c429923100c5a4fae8e5bc71c8a2d39af3de4888f50a0ac3755e6f%40%3Ccommits.creadur.apac
https://lists.apache.org/thread.html/r87ddc09295c27f25471269ad0a79433a91224045988b88f0413a97ec%40%3Cissues.bookkeeper.ap
https://lists.apache.org/thread.html/r8aa1e5c343b89aec5b69961471950e862f15246cb6392910161c389b%40%3Cissues.maven.apache.
https://lists.apache.org/thread.html/r9e52a6c72c8365000ecd035e48cc9fee5a677a150350d4420c46443d%40%3Cdev.drill.apache.org
https://lists.apache.org/thread.html/ra539f20ef0fb0c27ee39945b5f56bf162e5c13d1c60f7344dab8de3b%40%3Cissues.maven.apache.
https://lists.apache.org/thread.html/ra8bc6b61c5df301a6fe5a716315528ecd17ccb8a7f907e24a47a1a5e%40%3Cissues.lucene.apache
https://lists.apache.org/thread.html/rad6222134183046f3928f733bf680919e0c390739bfbfe6c90049673%40%3Cissues.drill.apache.
https://lists.apache.org/thread.html/rae14ae25ff4a60251e3ba2629c082c5ba3851dfd4d21218b99b56652%40%3Cissues.solr.apache.o
https://lists.apache.org/thread.html/rb33212dab7beccaf1ffef9b88610047c644f644c7a0ebdc44d77e381%40%3Ccommits.turbine.apac
https://lists.apache.org/thread.html/rb4ba262d6f08ab9cf8b1ebbcd9b00b0368ffe90dad7ad7918b4b56fc%40%3Cdev.drill.apache.org
https://lists.apache.org/thread.html/rb725052404fabffbe093c83b2c46f3f87e12c3193a82379afbc529f8%40%3Csolr-user.lucene.apa
https://lists.apache.org/thread.html/rc0863892ccfd9fd0d0ae10091f24ee769fb39b8957fe4ebabfc11f17%40%3Cdev.jackrabbit.apach
https://lists.apache.org/thread.html/rc3739e0ad4bcf1888c6925233bfc37dd71156bbc8416604833095c42%40%3Cdev.drill.apache.org
https://lists.apache.org/thread.html/rc505fee574fe8d18f9b0c655a4d120b0ae21bb6a73b96003e1d9be35%40%3Cissues.solr.apache.o

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Source: NIST National Vulnerability Database (record CVE-2020-13956), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.