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
Trending — 3 sources updated this weekWeaponized
7.5EG
EchelonGraph verdictPatch 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: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
7.5(low)
EG Risk
73(Track)
EG Risk 73/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
87%
EPSS %ILE
100%
KEV
Not listed

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 12× in last 7d / 18× 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. 2026-07-26 13:47 UTCEG score recompute▲ 7.50
  2. 2026-07-25 14:12 UTCEPSS rescore
  3. 2026-07-23 01:15 UTCGHSA enrichment
  4. 2026-07-23 01:13 UTCGHSA enrichment
  5. 2026-07-23 01:10 UTCGHSA enrichment
  6. 2026-07-23 01:09 UTCEG score recompute▼ 9.00
  7. 2026-07-23 00:13 UTCEG score recompute
  8. 2026-07-22 21:51 UTCEG score recompute
  9. 2026-07-22 14:04 UTCEPSS rescore
  10. 2026-07-22 14:04 UTCEPSS rescore
  11. 2026-07-20 17:03 UTCEPSS rescore
  12. 2026-07-20 17:03 UTCEPSS rescore
  13. 2026-07-16 16:58 UTCEPSS rescore
  14. 2026-07-13 22:26 UTCEPSS rescore
  15. 2026-07-13 06:08 UTCEPSS rescore
  16. 2026-07-04 06:27 UTCEPSS rescore
  17. 2026-06-30 23:19 UTCEPSS rescore
  18. 2026-06-30 23:19 UTCEPSS rescore
  19. 2026-06-24 14:02 UTCEPSS rescore
  20. 2026-06-24 14:02 UTCEPSS rescore
  21. 2026-06-23 21:30 UTCEPSS rescore
  22. 2026-06-17 17:49 UTCEPSS rescore
  23. 2026-06-17 17:49 UTCEPSS rescore
  24. 2026-06-15 17:44 UTCEPSS rescore
  25. 2026-06-12 23:08 UTCEPSS rescore
Show 22 more
  1. 2026-06-11 13:56 UTCEPSS rescore
  2. 2026-06-08 14:14 UTCEPSS rescore
  3. 2026-06-02 20:10 UTCEPSS rescore
  4. 2026-06-02 20:10 UTCEPSS rescore
  5. 2026-05-29 13:41 UTCEPSS rescore
  6. 2026-05-29 13:41 UTCEPSS rescore
  7. 2026-05-28 23:13 UTCEG score recompute
  8. 2026-05-28 23:13 UTCGHSA enrichment
  9. 2026-05-28 13:42 UTCEPSS rescore
  10. 2026-05-28 13:42 UTCEPSS rescore
  11. 2026-05-28 13:42 UTCEPSS rescore
  12. 2026-05-27 13:38 UTCEPSS rescore
  13. 2026-05-27 13:38 UTCEPSS rescore
  14. 2026-05-26 07:16 UTCEPSS rescore
  15. 2026-05-26 07:16 UTCEPSS rescore
  16. 2026-05-20 22:37 UTCEPSS rescore
  17. 2026-05-20 22:37 UTCEPSS rescore
  18. 2026-05-20 11:21 UTCEPSS rescore
  19. 2026-05-20 11:21 UTCEPSS rescore
  20. 2026-05-20 11:21 UTCEPSS rescore
  21. 2026-05-18 21:29 UTCEPSS rescore
  22. 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.

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

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

    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 ↗
  • 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 ↗

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 in the National Vulnerability Database 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. FIRST EPSS estimates a 87% probability of exploitation in the next 30 days, which ranks it in the top 0.3% of all scored CVEs.
How do I remediate CVE-2013-2028?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-2028, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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