CVE-2017-7674

CVE-2017-7674 is a medium-severity vulnerability in Apache Tomcat with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

• Severity: Medium (CVSS 3.x base score 4.3)
• CVSS v2: 4.3
• EPSS exploit prediction: 8% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-345
• Affected product: Apache Tomcat
• Published: 2017-08-11
• Last modified: 2026-06-17

Description

The CORS Filter in Apache Tomcat 9.0.0.M1 to 9.0.0.M21, 8.5.0 to 8.5.15, 8.0.0.RC1 to 8.0.44 and 7.0.41 to 7.0.78 did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side cache poisoning in some circumstances.

Frequently asked questions

What is CVE-2017-7674?

The CORS Filter in Apache Tomcat 9.0.0.M1 to 9.0.0.M21, 8.5.0 to 8.5.15, 8.0.0.RC1 to 8.0.44 and 7.0.41 to 7.0.78 did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side cache poisoning in some circumstances.

How severe is CVE-2017-7674?

CVE-2017-7674 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2017-7674 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-7674?

CVE-2017-7674 primarily affects Apache Tomcat. In total, 123 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-7674?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-7674 published?

CVE-2017-7674 was published on 2017-08-11 and last updated on 2026-06-17.

References

• http://www.debian.org/security/2017/dsa-3974
• http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
• http://www.securityfocus.com/bid/100280
• https://access.redhat.com/errata/RHSA-2017:1801
• https://access.redhat.com/errata/RHSA-2017:1802
• https://access.redhat.com/errata/RHSA-2017:3081
• https://lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/22b4bb077502f847e2b9fcf00b96e81e734466ab459780ff73b60c0f%40%3Cannounce.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/5c0e00fd31efc11e147bf99d0f03c00a734447d3b131ab0818644cdb%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/845312a10aabbe2c499fca94003881d2c79fc993d85f34c1f5c77424%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/e85e83e9954f169bbb77b44baae5a33d8de878df557bb32b7f793661%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/eb6efa8d59c45a7a9eff94c4b925467d3b3fec8ba7697f3daa314b04%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r15695e6203b026c9e9070ca9fa95fb17dd4cd88e5342a7dc5e1e7b85%40%3Cusers.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r1c62634b7426bee5f553307063457b99c84af73b078ede4f2592b34e%40%3Cusers.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r409efdf706c2077ae5c37018a87da725a3ca89570a9530342cdc53e4%40%3Cusers.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
• https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2018/06/msg00008.html
• https://security.netapp.com/advisory/ntap-20180614-0003/
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03828en_us

Affected products (123)

• cpe:2.3:a:apache:tomcat:7.0.41:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.42:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.43:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.44:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.45:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.46:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.47:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.48:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.49:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.50:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.52:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.53:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.54:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.55:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.56:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.57:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.58:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.59:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.60:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.61:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.62:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.63:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.64:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.65:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.66:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.67:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.68:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.69:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.70:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.71:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.72:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.73:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.74:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.75:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.76:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.77:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:7.0.78:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:8.0.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:apache:tomcat:8.0.0:rc10:*:*:*:*:*:*

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