CVE-2022-33990: Misinterpretation of special domain name characters in dproxy-nexgen (aka dproxy nexgen) leads to cache poison

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HIGH 7.5REMOTEMITIGATE

CVE-2022-33990 is a high-severity flaw (CVSS 7.5) affecting dproxy-nexgen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Misinterpretation of special domain name characters in dproxy-nexgen (aka dproxy nexgen) leads to cache poisoning because domain names and their associated IP addresses are cached in their misinterpreted form.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Published	2022-08-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dproxy-nexgen project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-08-15 13:15 UTCPublished CVE record published
2026-06-17 04:49 UTCUpdated Record last modified

dproxy-nexgen project dproxy-nexgen MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy dproxy-nexgen || rpm -q dproxy-nexgen || dproxy-nexgen --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · 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-2022-33990?

dproxy-nexgen: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-33990 being exploited?

CVE-2022-33990 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-2022-33990 affect?

CVE-2022-33990 affects dproxy-nexgen. Severity is high (CVSS 7.5). Misinterpretation of special domain name characters in dproxy-nexgen (aka dproxy nexgen) leads to cache poisoning because domain names and their associated IP addresses are cached in their misinterpreted form.

How urgent is CVE-2022-33990?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-33991 MEDIUM 5.3 MITIGATE dproxy-nexgen (aka dproxy nexgen) forwards and caches DNS queries with the CD (aka checking disabled) bit set
CVE-2022-33989 MEDIUM 5.3 MITIGATE dproxy-nexgen (aka dproxy nexgen) uses a static UDP source port (selected randomly only at boot time) in upstr
CVE-2022-33988 HIGH 7.5 MITIGATE dproxy-nexgen (aka dproxy nexgen) re-uses the DNS transaction id (TXID) value from client queries, which allow

References

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