CVE-2017-8809

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 7.7%CVSS: 9.8Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

api.php in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 has a Reflected File Download vulnerability.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
65
EG Risk 65/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability30% × 15%
EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
7.7%
EPSS %ILE
94th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and 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 total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

November 15, 2017

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Oct 5, 2026
Patch available.
Web page

[SECURITY] [DSA 4036-1] mediawiki security update

https://www.debian.org/security/2017/dsa-4036
Web page

[MediaWiki-announce] Security release: 1.29.2 / 1.28.3 / 1.27.4 - MediaWiki-announce - lists.wikimedia.org

https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html
Web page
http://www.securitytracker.com/id/1039812

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
mediawiki—
  • every version up to 1:1.27.4-1: fixed in 1:1.27.4-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
mediawiki—
  • every version up to 1:1.27.4-1: fixed in 1:1.27.4-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
mediawiki—
  • every version up to 1:1.27.4-1: fixed in 1:1.27.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
mediawiki—
  • every version up to 1:1.27.4-1: fixed in 1:1.27.4-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
mediawiki1:1.27.3-1, 1:1.27.4-1~bpo8+1
  • every version up to 1:1.27.4-1~deb9u1: fixed in 1:1.27.4-1~deb9u1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 23× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 83 of 175 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 17 repeat rows among the latest 100 are merged into the row they repeat. The 92 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:41 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  2. 2026-10-10 19:55 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  3. 2026-10-09 20:02 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  4. 2026-10-08 16:36 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  5. 2026-10-07 23:41 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  6. 2026-10-06 15:12 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  7. 2026-10-05 17:39 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  8. 2026-10-03 21:58 UTCOSV refresh
  9. 2026-10-03 14:21 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  10. 2026-09-30 14:59 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  11. 2026-09-30 09:44 UTCEG score recompute
  12. 2026-09-28 13:45 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  13. 2026-09-27 13:40 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  14. 2026-09-26 15:53 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  15. 2026-09-26 00:19 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  16. 2026-09-24 13:59 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  17. 2026-09-23 13:42 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  18. 2026-09-21 20:27 UTCEPSS rescoreEPSS 6.2% · 93rd percentile
  19. 2026-09-19 15:36 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  20. 2026-09-17 19:22 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  21. 2026-09-15 03:05 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  22. 2026-09-14 12:14 UTCOSV refresh
  23. 2026-09-12 14:56 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  24. 2026-09-11 09:31 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  25. 2026-09-07 15:56 UTCEPSS rescoreEPSS 7.7% · 94th percentile
Show 58 more
  1. 2026-09-05 15:24 UTCEPSS rescoreEPSS 6.2% · 93rd percentile
  2. 2026-09-04 13:56 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  3. 2026-09-04 05:02 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  4. 2026-09-02 14:07 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  5. 2026-09-01 03:31 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  6. 2026-08-30 19:13 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  7. 2026-08-28 21:36 UTCEPSS rescoreEPSS 6.2% · 93rd percentile
  8. 2026-08-27 14:21 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  9. 2026-08-26 14:41 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  10. 2026-08-26 13:13 UTCOSV refresh
  11. 2026-08-25 13:44 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  12. 2026-08-23 00:14 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  13. 2026-08-21 23:44 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  14. 2026-08-19 16:59 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  15. 2026-08-18 13:43 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  16. 2026-08-16 14:51 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  17. 2026-08-16 02:10 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  18. 2026-08-15 01:26 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  19. 2026-08-12 13:46 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  20. 2026-08-10 02:09 UTCOSV refresh
  21. 2026-08-09 13:42 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  22. 2026-08-08 16:32 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  23. 2026-08-07 16:22 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  24. 2026-08-06 13:42 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  25. 2026-08-05 19:13 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  26. 2026-08-02 02:23 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  27. 2026-08-01 04:12 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  28. 2026-07-30 16:24 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  29. 2026-07-30 01:26 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  30. 2026-07-28 15:32 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  31. 2026-07-25 02:41 UTCOSV refresh
  32. 2026-07-23 14:15 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  33. 2026-07-23 01:31 UTCEG score recompute
  34. 2026-07-22 22:10 UTCEG score recompute
  35. 2026-07-22 14:04 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  36. 2026-07-21 15:21 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  37. 2026-07-20 17:04 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  38. 2026-07-19 14:28 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  39. 2026-07-19 02:26 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  40. 2026-07-18 10:01 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  41. 2026-07-16 16:59 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  42. 2026-07-15 16:54 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  43. 2026-07-15 01:56 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  44. 2026-07-13 22:26 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  45. 2026-07-12 05:43 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  46. 2026-07-11 08:24 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  47. 2026-07-09 19:06 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  48. 2026-07-08 15:11 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  49. 2026-07-07 21:42 UTCOSV refresh
  50. 2026-07-07 13:42 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  51. 2026-07-06 16:24 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  52. 2026-07-06 02:20 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  53. 2026-07-05 02:27 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  54. 2026-07-04 06:28 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  55. 2026-07-02 16:54 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  56. 2026-07-01 15:03 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  57. 2026-06-30 23:19 UTCEPSS rescoreEPSS 7.7% · 93rd percentile
  58. 2026-06-29 14:03 UTCEPSS rescoreEPSS 7.7% · 93rd percentile

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCmotikan2010/CVE-2017-8809_MediaWiki_RFD
    Published Jan 22, 2020

    CVE-2017-8809 Docker - RFD(Reflected File Download) for MediaWiki

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2017-8809?
CVE-2017-8809 is a critical-severity vulnerability; its CVE record was published on November 15, 2017. api.php in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 has a Reflected File Download vulnerability.
When was CVE-2017-8809 made public?
CVE-2017-8809 was made public on November 15, 2017: that is the date its CVE record's CNA, Debian GNU/Linux, gives for when the vulnerability was made public. The CVE record itself was published on November 15, 2017. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2017-8809 actively exploited?
CVE-2017-8809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.7% probability of exploitation in the next 30 days (94th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-8809?
CVE-2017-8809 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-8809?
A fix for CVE-2017-8809 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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