CVE-2021-33813: An XXE issue in SAXBuilder in JDOM through 2.0.6 allows attackers to cause a denial of service via a crafted H
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HIGH 7.5REMOTEWATCHLISTUPGRADEDOWNGRADEDOWNGRADE
CVE-2021-33813 is a high-severity flaw (CVSS 7.5) affecting jdom, solr, tika. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An XXE issue in SAXBuilder in JDOM through 2.0.6 allows attackers to cause a denial of service via a crafted HTTP request.
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
apache tika DOWNGRADE
Affected: 1.25
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.25
1. Check installed version
apt-cache policy tika || rpm -q tika || tika --version
2. No fixed release: DOWNGRADE to a release before 1.25 (Debian / Ubuntu)
apt-cache madison tika
sudo apt install tika=<VERSION_BEFORE_1.25>
sudo apt-mark hold tika
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list tika
sudo dnf downgrade tika-<VERSION_BEFORE_1.25>
sudo dnf versionlock add tika
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
debian debian linux MITIGATE
Affected: 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 9.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fedoraproject fedora MITIGATE
Affected: 35
Fixed in: no fixed release known
Safe to downgrade to: a release before 35
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
oracle communications messaging server MITIGATE
Affected: 8.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.1
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-33813?
jdom: upgrade to newer than 2.0.6; solr: downgrade or apply the listed mitigation; tika: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-33813 being exploited?
CVE-2021-33813 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-33813 affect?
CVE-2021-33813 affects jdom, solr, tika. Severity is high (CVSS 7.5). An XXE issue in SAXBuilder in JDOM through 2.0.6 allows attackers to cause a denial of service via a crafted HTTP request.
How urgent is CVE-2021-33813?
Priority 66/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist
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