libdns in ISC BIND 9.7.x and 9.8.x before 9.8.4-P2, 9.8.5 before 9.8.5b2, 9.9.x before 9.9.2-P2, and 9.9.3 before 9.9.3b2 on UNIX platforms allows remote attackers to cause a denial of service (memory consumption) via a crafted regular expression, as demonstrated by a memory-exhaustion attack against a machine running a named process.
CVE-2013-2266
HIGHCVSS v2 · 7.87.8—Elevated
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.8 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 42.9% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.
Sources: epss, nvd_v2
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 43%CVSS v2: 7.8Exploit: Elevated riskExposed services: —
A fix is available — apply it.
Internet exposure
The internet-exposure footprint is temporarily unavailable — the KEV-Exposure radar's record for this CVE could not be loaded just now. That is not a finding of zero exposed services; please retry shortly.
- CVSS v2.0 (legacy)
- 7.8HIGHNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 7.8HIGHlow confidence
- EG Risk
- 57EG Risk 57/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity78% × 45%Exploitation43% × 40%Automatability30% × 15%CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 43%
- EPSS %ILE
- 98th
- KEV
- Not listed
CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
March 28, 2013
Last Modified
April 29, 2026
References (30)
- cve@mitrehttp://linux.oracle.com/errata/ELSA-2014-1244
- cve@mitrehttp://lists.apple.com/archives/security-announce/2013/Sep/msg00002.html
- cve@mitrehttp://lists.fedoraproject.org/pipermail/package-announce/2013-April/101500.html
- cve@mitrehttp://lists.fedoraproject.org/pipermail/package-announce/2013-April/101603.html
- cve@mitrehttp://marc.info/?l=bugtraq&m=136804614120794&w=2
- cve@mitrehttp://rhn.redhat.com/errata/RHSA-2013-0689.html
- cve@mitrehttp://rhn.redhat.com/errata/RHSA-2013-0690.html
- cve@mitrehttp://support.apple.com/kb/HT5880
- cve@mitrehttp://www.debian.org/security/2013/dsa-2656
- cve@mitrehttp://www.isc.org/software/bind/advisories/cve-2013-2266
- cve@mitrehttp://www.securityfocus.com/bid/58736
- cve@mitrehttp://www.ubuntu.com/usn/USN-1783-1
- cve@mitrehttps://kb.isc.org/article/AA-00871/
- cve@mitrehttps://kb.isc.org/article/AA-00879/
- cve@mitrehttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19579
Vendor Advisories for CVE-2013-2266
Vendor advisories for this CVE are temporarily unavailable — the list could not be loaded just now. That is not a sign that none exist; please retry shortly.
Affected Packages
(5 across 5 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| bind9 | — | 1:9.8.4.dfsg.P1-6+nmu1 (one range) | — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| bind9 | — | 1:9.8.4.dfsg.P1-6+nmu1 (one range) | — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| bind9 | — | 1:9.8.4.dfsg.P1-6+nmu1 (one range) | — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| bind9 | — | 1:9.8.4.dfsg.P1-6+nmu1 (one range) | — |
Debian:6.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| bind9 | 1:9.7.2.dfsg.P3-1.1 ... 1:9.7.3.dfsg-1~squeeze9 (13 versions) | 1:9.7.3.dfsg-1~squeeze10 (one range) | — |
Related CVEs
Related CVEs are temporarily unavailable — the same-product, same-vendor and same-CWE lists could not be loaded just now. That is not a sign that none exist; please retry shortly.
Frequently asked(4)
What is CVE-2013-2266?
CVE-2013-2266 is a high vulnerability published on March 28, 2013. libdns in ISC BIND 9.7.x and 9.8.x before 9.8.4-P2, 9.8.5 before 9.8.5b2, 9.9.x before 9.9.2-P2, and 9.9.3 before 9.9.3b2 on UNIX platforms allows remote attackers to cause a denial of service (memory consumption) via a crafted regular expression, as demonstrated by a memory-exhaustion attack…
When was CVE-2013-2266 disclosed?
CVE-2013-2266 was first published on March 28, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-2266 actively exploited?
CVE-2013-2266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43% probability of exploitation in the next 30 days (98th percentile of EPSS-scored CVEs).
How do I remediate CVE-2013-2266?
A fix for CVE-2013-2266 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2013-2266
Is Your Infrastructure Affected by CVE-2013-2266?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.