CVE-2013-2028

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — 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:P/I:P/A:P. 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 87.5% 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
Weaponized
7.5EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 87%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 87%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

The ngx_http_parse_chunked function in http/ngx_http_parse.c in nginx 1.3.9 through 1.4.0 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based buffer overflow.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5HIGHlow confidence
EG Risk
73
EG Risk 73/100CISA 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 computed
Severity75% × 45%
Exploitation87% × 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 referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
87%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (EG-KEV: weaponized) · 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

July 20, 2013

Last Modified

April 29, 2026

References (20)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 2× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-30 14:58 UTCEPSS rescore
  2. 2026-09-29 20:14 UTCEG score recompute
  3. 2026-09-24 13:57 UTCEPSS rescore
  4. 2026-09-18 19:21 UTCEPSS rescore
  5. 2026-09-12 14:55 UTCEPSS rescore
  6. 2026-09-11 09:30 UTCEPSS rescore
  7. 2026-09-06 13:42 UTCEPSS rescore
  8. 2026-09-05 15:22 UTCEPSS rescore
  9. 2026-09-04 13:55 UTCEPSS rescore
  10. 2026-09-02 14:06 UTCEPSS rescore
  11. 2026-08-27 14:20 UTCEPSS rescore
  12. 2026-08-26 14:40 UTCEPSS rescore
  13. 2026-08-24 07:23 UTCEPSS rescore
  14. 2026-08-20 22:50 UTCEPSS rescore
  15. 2026-08-19 16:59 UTCEPSS rescore
  16. 2026-08-18 13:42 UTCEPSS rescore
  17. 2026-08-16 02:09 UTCEPSS rescore
  18. 2026-08-08 16:31 UTCEPSS rescore
  19. 2026-08-07 16:21 UTCEPSS rescore
  20. 2026-07-26 13:47 UTCEG score recompute▲ 7.50
  21. 2026-07-25 14:12 UTCEPSS rescore
  22. 2026-07-23 01:15 UTCGHSA enrichment
  23. 2026-07-23 01:13 UTCGHSA enrichment
  24. 2026-07-23 01:10 UTCGHSA enrichment
  25. 2026-07-23 01:09 UTCEG score recompute▼ 9.00
Show 41 more
  1. 2026-07-23 00:13 UTCEG score recompute
  2. 2026-07-22 21:51 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-22 14:04 UTCEPSS rescore
  5. 2026-07-20 17:03 UTCEPSS rescore
  6. 2026-07-20 17:03 UTCEPSS rescore
  7. 2026-07-16 16:58 UTCEPSS rescore
  8. 2026-07-13 22:26 UTCEPSS rescore
  9. 2026-07-13 06:08 UTCEPSS rescore
  10. 2026-07-04 06:27 UTCEPSS rescore
  11. 2026-06-30 23:19 UTCEPSS rescore
  12. 2026-06-30 23:19 UTCEPSS rescore
  13. 2026-06-24 14:02 UTCEPSS rescore
  14. 2026-06-24 14:02 UTCEPSS rescore
  15. 2026-06-23 21:30 UTCEPSS rescore
  16. 2026-06-17 17:49 UTCEPSS rescore
  17. 2026-06-17 17:49 UTCEPSS rescore
  18. 2026-06-15 17:44 UTCEPSS rescore
  19. 2026-06-12 23:08 UTCEPSS rescore
  20. 2026-06-11 13:56 UTCEPSS rescore
  21. 2026-06-08 14:14 UTCEPSS rescore
  22. 2026-06-02 20:10 UTCEPSS rescore
  23. 2026-06-02 20:10 UTCEPSS rescore
  24. 2026-05-29 13:41 UTCEPSS rescore
  25. 2026-05-29 13:41 UTCEPSS rescore
  26. 2026-05-28 23:13 UTCEG score recompute
  27. 2026-05-28 23:13 UTCGHSA enrichment
  28. 2026-05-28 13:42 UTCEPSS rescore
  29. 2026-05-28 13:42 UTCEPSS rescore
  30. 2026-05-28 13:42 UTCEPSS rescore
  31. 2026-05-27 13:38 UTCEPSS rescore
  32. 2026-05-27 13:38 UTCEPSS rescore
  33. 2026-05-26 07:16 UTCEPSS rescore
  34. 2026-05-26 07:16 UTCEPSS rescore
  35. 2026-05-20 22:37 UTCEPSS rescore
  36. 2026-05-20 22:37 UTCEPSS rescore
  37. 2026-05-20 11:21 UTCEPSS rescore
  38. 2026-05-20 11:21 UTCEPSS rescore
  39. 2026-05-20 11:21 UTCEPSS rescore
  40. 2026-05-18 21:29 UTCEPSS rescore
  41. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(9 references)

Working exploit code is in the public domain (1 Metasploit module) (4 GitHub PoCs) (4 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-25775✓ verified
    First seen May 28, 2013

    Nginx 1.3.9 < 1.4.0 - Chuncked Encoding Stack Buffer Overflow (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/http/nginx_chunked_size✓ verified
    First seen May 7, 2013

    Nginx HTTP Server 1.3.9-1.4.0 Chunked Encoding Stack Buffer Overflow

    Open source ↗
  • GitHub PoCm4drat/CVE-2013-2028-Exploit
    First seen Jun 27, 2020

    CVE-2013-2028 python exploit

    Open source ↗
  • GitHub PoCtachibana51/CVE-2013-2028-x64-bypass-ssp-and-pie-PoC
    First seen Aug 3, 2019

    this is not stable

    Open source ↗
  • GitHub PoCkitctf/nginxpwn
    First seen Mar 23, 2016

    Exploitation Training -- CVE-2013-2028: Nginx Stack Based Buffer Overflow

    Open source ↗
  • Exploit-DBEDB-32277
    First seen Mar 15, 2014

    Nginx 1.4.0 (Generic Linux x64) - Remote Overflow

    Open source ↗
  • Exploit-DBEDB-26737
    First seen Jul 11, 2013

    Nginx 1.3.9/1.4.0 (x86) - Brute Force

    Open source ↗
  • GitHub PoCdanghvu/nginx-1.4.0
    First seen May 21, 2013

    For the analysis of CVE-2013-2028

    Open source ↗
  • Exploit-DBEDB-25499
    First seen May 17, 2013

    Nginx 1.3.9 < 1.4.0 - Denial of Service (PoC)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2013-2028?
CVE-2013-2028 is a high vulnerability published on July 20, 2013. The ngxhttpparsechunked function in http/ngxhttp_parse.c in nginx 1.3.9 through 1.4.0 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based…
When was CVE-2013-2028 disclosed?
CVE-2013-2028 was first published on July 20, 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-2013-2028 actively exploited?
CVE-2013-2028 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 87% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2013-2028?
A fix for CVE-2013-2028 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Dependency Blast Radius

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