CVE-2015-5477: ISC BIND Data Processing Errors Vulnerability

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HIGH 7.5EXPLOITEDREMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2015-5477 is a high-severity flaw (CVSS 7.5) affecting junos, fedora, enterprise linux, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) via TKEY queries.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	99.4% (top 1%)
CISA exploited list	Yes, fix due 2026-10-11
Weakness	CWE-19, CWE-617
Published	2015-07-29
Last modified	2026-10-09

Publisher (CNA): MITRE · Vendor: debian · fedoraproject · juniper · oracle · redhat

Am I affected?

Timeline

2015-07-29 14:59 UTCPublished CVE record published
2026-10-08Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-10-09 19:12 UTCUpdated Record last modified
2026-10-11Deadline CISA due date for US federal agencies to patch

juniper junos UPGRADE

Affected: < 12.1 · >= 13.1 and < 13.2 · 12.1 · 12.1 r11 · 12.1r · 12.1x44 · 12.1x44 d10 · 12.1x44 d15

Fixed in: 12.1, 13.2

Safe to downgrade to: a release before 12.1

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.

fedoraproject fedora MITIGATE

Affected: 21 · 22

Fixed in: no fixed release known

Safe to downgrade to: a release before 21

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.

redhat enterprise linux MITIGATE

Affected: 5.0 · 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

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.

redhat enterprise linux aus MITIGATE

Affected: 6.4 · 6.5 · 6.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.4

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.

debian debian linux MITIGATE

Affected: 7.0 · 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

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.

oracle vm server DOWNGRADE

Affected: 3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2

1. Check installed version

apt-cache policy vm-server || rpm -q vm-server || vm-server --version

2. No fixed release: DOWNGRADE to a release before 3.2 (Debian / Ubuntu)

apt-cache madison vm-server sudo apt install vm-server=<VERSION_BEFORE_3.2> sudo apt-mark hold vm-server

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

dnf --showduplicates list vm-server sudo dnf downgrade vm-server-<VERSION_BEFORE_3.2> sudo dnf versionlock add vm-server

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · uv · FIXED · 0.13.5-1.fc46 · FEDORA-2026-61ea5a28c6 · source

sudo dnf upgrade --advisory=FEDORA-2026-61ea5a28c6

Debian 12 · bind9 · FIXED · 1:9.9.5.dfsg-11

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.9.5.dfsg-11" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · bind9 · FIXED · 1:9.9.5.dfsg-11

sudo apt update && sudo apt install --only-upgrade bind9 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' bind9)" ge "1:9.9.5.dfsg-11" && echo PATCHED || echo STILL-VULNERABLE

RHEL 5 · bind · FIXED · bind-9.3.6-25.P1.el5_11.3

sudo dnf upgrade --advisory=RHSA-2015:1514 rpm -q bind

RHEL 5 · bind97 · FIXED · bind97-9.7.0-21.P2.el5_11.2

sudo dnf upgrade --advisory=RHSA-2015:1515 rpm -q bind97

RHEL 6 · bind · FIXED · bind-9.8.2-0.37.rc1.el6_7.2

sudo dnf upgrade --advisory=RHSA-2015:1513 rpm -q bind

RHEL 6.4 Advanced Update Support · bind · FIXED · bind-9.8.2-0.17.rc1.el6_4.7

sudo dnf upgrade --advisory=RHSA-2016:0078 rpm -q bind

RHEL 6.5 Advanced Update Support · bind · FIXED · bind-9.8.2-0.23.rc1.el6_5.2

sudo dnf upgrade --advisory=RHSA-2016:0078 rpm -q bind

Amazon Linux 1 · see advisory · FIXED · ALAS-2015-573 · source

sudo yum update --advisory=ALAS-2015-573

Public exploits and detection

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

GitHub PoC: robertdavidgraham/cve-2015-5477 (64 stars)
GitHub PoC: elceef/tkeypoc (14 stars)
GitHub PoC: hmlio/vaas-cve-2015-5477 (1 stars)
Write-up: kb.isc.org/article/AA-01272
Write-up: kb.isc.org/article/AA-01306
Exploit-DB: ISC BIND 9 - TKEY (PoC)
Exploit-DB: ISC BIND 9 - TKEY Remote Denial of Service (PoC)
Metasploit: BIND TKEY Query Denial of Service

Verify at the official source NVD · CVE Program · CISA KEV catalog · 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.

References

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