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

> Remote attackers can crash the ISC BIND DNS server by sending malicious TKEY queries, causing a denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Yes, since 8 Oct 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Jul 2015
- **Updated:** 9 Oct 2026
- **Also known as:** DEBIAN-CVE-2015-5477, DLA-285-1, DSA-3319-1, GHSA-4622-vjcx-p39j, MGASA-2015-0298, RHSA-2015:1513, RHSA-2015:1514, RHSA-2015:1515, SUSE-SU-2015:1304-1, SUSE-SU-2015:1305-1, SUSE-SU-2015:1316-1, UBUNTU-CVE-2015-5477

## What is CVE-2015-5477?

CVE-2015-5477 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 29 Jul 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-19, CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2015-5477?

It affects 21 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `bind` | Red Hat:enterprise_linux:5::client | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-debuginfo` | Red Hat:enterprise_linux:5::client | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-libs` | Red Hat:enterprise_linux:5::client | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-sdb` | Red Hat:enterprise_linux:5::client | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-utils` | Red Hat:enterprise_linux:5::client | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind` | Red Hat:enterprise_linux:5::client_workstation | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-chroot` | Red Hat:enterprise_linux:5::client_workstation | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-debuginfo` | Red Hat:enterprise_linux:5::client_workstation | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-devel` | Red Hat:enterprise_linux:5::client_workstation | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-libbind-devel` | Red Hat:enterprise_linux:5::client_workstation | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind97` | Red Hat:enterprise_linux:5::client_workstation | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-chroot` | Red Hat:enterprise_linux:5::client_workstation | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-debuginfo` | Red Hat:enterprise_linux:5::client_workstation | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-devel` | Red Hat:enterprise_linux:5::client_workstation | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-libs` | Red Hat:enterprise_linux:5::client_workstation | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-utils` | Red Hat:enterprise_linux:5::client_workstation | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `caching-nameserver` | Red Hat:enterprise_linux:5::client_workstation | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-chroot` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-devel` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-libbind-devel` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-libs` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-sdb` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind-utils` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind97` | Red Hat:enterprise_linux:5::server | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-chroot` | Red Hat:enterprise_linux:5::server | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-devel` | Red Hat:enterprise_linux:5::server | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-libs` | Red Hat:enterprise_linux:5::server | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `bind97-utils` | Red Hat:enterprise_linux:5::server | All versions | 32:9.7.0-21.P2.el5_11.2 |
| `caching-nameserver` | Red Hat:enterprise_linux:5::server | All versions | 30:9.3.6-25.P1.el5_11.3 |
| `bind` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind-chroot` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind-debuginfo` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind-devel` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind-libs` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind-sdb` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind-utils` | Red Hat:enterprise_linux:6::client | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |
| `bind` | Red Hat:enterprise_linux:6::computenode | All versions | 32:9.8.2-0.37.rc1.el6_7.2 |

Products: Apple Os X Server, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Hp Hp-Ux, Hp Openvms, Hpe Dns, Hpe Vcx, Isc Bind, Juniper Junos, Netapp Clustered Data Ontap, Opensuse Evergreen, Opensuse Opensuse, Oracle Solaris, Oracle Vm Server, Redhat Enterprise Linux, Redhat Enterprise Linux Aus, Suse Linux Enterprise Debuginfo, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server and 1 more.

## How do I fix CVE-2015-5477?

Upgrade to a fixed version. US federal agencies must fix it by 11 Oct 2026.

## Is CVE-2015-5477 being exploited?

Yes. Attackers have exploited CVE-2015-5477 in the wild since at least 8 Oct 2026.

Public exploit code:

- PoC exploit for CVE-2015-5477 BIND9 TKEY assertion failure (github_poc): https://github.com/robertdavidgraham/cve-2015-5477
- PoC exploit code for CVE-2015-5477 BIND9 TKEY remote DoS vulnerability (github_poc): https://github.com/elceef/tkeypoc
- Vulnerability as a service: showcasing CVS-2015-5447, a DDoS condition in the bind9 software (github_poc): https://github.com/hmlio/vaas-cve-2015-5477
- PoC for BIND9 TKEY assert DoS (CVE-2015-5477) (github_poc): https://github.com/knqyf263/cve-2015-5477
- PoC exploit for CVE-2015-5477 in php (github_poc): https://github.com/ilanyu/cve-2015-5477
- BIND TKEY Query Denial of Service (metasploit)

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2016-4754](https://insights.sbomify.com/CVE-2016-4754/): Weak cryptography in n/a (high 7.5)
- [CVE-2014-4424](https://insights.sbomify.com/CVE-2014-4424/): SQL injection in n/a (high 7.5)
- [CVE-2013-5143](https://insights.sbomify.com/CVE-2013-5143/): Weak cryptography in n/a (medium 6.8)
- [CVE-2014-4406](https://insights.sbomify.com/CVE-2014-4406/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2015-1150](https://insights.sbomify.com/CVE-2015-1150/): Security feature bypass in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-5477 and fix it if it is affected.

What it is: CVE-2015-5477 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 29 Jul 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2015-5477 in the wild since at least 8 Oct 2026.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2015-5477/ (Markdown: https://insights.sbomify.com/CVE-2015-5477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-5477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-5477
- OSV: https://osv.dev/vulnerability/CVE-2015-5477

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-5477/
Summaries are generated and may contain mistakes; the official description above is the record.