Skip to content
Fencer Vulns
high 7.5

CVE-2023-34981 json

Apache Tomcat: AJP response header mix-up

published 2023-06-21 3 y ago modified 2026-09-08 2 mo ago also BIT-tomcat-2023-34981 , EUVD-2023-1844 , GHSA-mppv-79ch-vw6q

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

A regression in the fix for bug 66512 in Apache Tomcat 11.0.0-M5, 10.1.8, 9.0.74 and 8.5.88 meant that, if a response did not include any HTTP headers no AJP SEND_HEADERS messare woudl be sent for the response which in turn meant that at least one AJP proxy (mod_proxy_ajp) would use the response headers from the previous request leading to an information leak.

Patch / fix

  • maven org.apache.tomcat.embed:tomcat-embed-core 9.0.75, 10.1.9, 11.0.0-M6
  • maven org.apache.tomcat:tomcat-coyote 8.5.89
  • bitnami tomcat 8.5.89, 9.0.75, 10.1.9
  • tomcat10 Debian 14, Debian 13 10.1.10-1

debian advisories DEBIAN-CVE-2023-34981

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-34981 updated cvss 7.5

tomcat: response headers from the previous request leading to an information leak

  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 tomcat, tomcat-lib, tomcat-webapps, tomcat-el-3.0-api, pki-servlet-engine, tomcat-docs-webapp, +4 more Red Hat Enterprise Linux 9 tomcat, tomcat-lib, tomcat-webapps, tomcat-el-3.0-api, pki-servlet-engine, tomcat-docs-webapp, +4 more Red Hat JBoss Web Server 5 tomcat Red Hat JBoss Web Server 6 tomcat
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.12% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat.embed:tomcat-embed-core
>=11.0.0-M5, <11.0.0-M6
>=10.1.8, <10.1.9
>=9.0.74, <9.0.75
11.0.0-M6
10.1.9
9.0.75
maven org.apache.tomcat:tomcat-coyote
>=8.5.88, <8.5.89
8.5.89
bitnami tomcat
>=8.5.88, <8.5.89
>=9.0.74, <9.0.75
>=10.1.8, <10.1.9
8.5.89
9.0.75
10.1.9

Affected products

  • Apache Software Foundation Apache Tomcat
  • apache tomcat

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.