CVE-2007-1866: Stack-based buffer overflow in the dns_decode_reverse_name function in dns_decode.c in dproxy-nexgen allows re

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HIGH 10.0DOWNGRADE

CVE-2007-1866 is a high-severity flaw (CVSS 10.0) affecting dproxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in the dns_decode_reverse_name function in dns_decode.c in dproxy-nexgen allows remote attackers to execute arbitrary code by sending a crafted packet to port 53/udp, a different issue than CVE-2007-1465.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	10.3% (top 4%)
CISA exploited list	No
Published	2007-04-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: dproxy

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-04-04 16:19 UTCPublished CVE record published
2026-06-16 22:38 UTCUpdated Record last modified

dproxy dproxy DOWNGRADE

Affected: nexgen

Fixed in: no fixed release known

Safe to downgrade to: a release before nexgen

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before nexgen (Debian / Ubuntu)

apt-cache madison dproxy sudo apt install dproxy=<VERSION_BEFORE_nexgen> sudo apt-mark hold dproxy

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list dproxy sudo dnf downgrade dproxy-<VERSION_BEFORE_nexgen> sudo dnf versionlock add dproxy

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: dproxy-nexgen (Linux x86) - Remote Buffer Overflow

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-2007-1866?

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

Is CVE-2007-1866 being exploited?

CVE-2007-1866 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-2007-1866 affect?

CVE-2007-1866 affects dproxy. Severity is high (CVSS 10.0). Stack-based buffer overflow in the dns_decode_reverse_name function in dns_decode.c in dproxy-nexgen allows remote attackers to execute arbitrary code by sending a crafted packet to port 53/udp, a different issue than CVE-2007-1465.

How urgent is CVE-2007-1866?

Priority 64/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2007-1465 HIGH 10.0 DOWNGRADE Stack-based buffer overflow in dproxy.c for dproxy 0.1 through 0.5 allows remote attackers to execute arbitrar

References

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