CVE-2013-1895

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 2.8% (86th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.8%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The py-bcrypt module before 0.3 for Python does not properly handle concurrent memory access, which allows attackers to bypass authentication via multiple authentication requests, which trigger the password hash to be overwritten.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
39
EG Risk 39/100CISA 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%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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
2.8%
EPSS %ILE
86th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

January 28, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 29, 2026
Patch available.
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/83039
generic

CVE-2013-1895 - PSIRT.COM

http://www.securityfocus.com/bid/58702
generic

oss-security - CVE-2013-1895 py-bcrypt 0.2 concurrency vulnerability (auth bypass)

http://www.openwall.com/lists/oss-security/2013/03/26/2

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
python-bcrypt—
  • every version up to 0.4-1: fixed in 0.4-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-bcrypt—
  • every version up to 0.4-1: fixed in 0.4-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-bcrypt—
  • every version up to 0.4-1: fixed in 0.4-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-bcrypt—
  • every version up to 0.4-1: fixed in 0.4-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
py-bcrypt0.1, 0.2
  • every version up to 0.3: fixed in 0.3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× 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.

Showing the most recent 100 of 137 total refreshes for this CVE.

  1. 2026-10-09 20:00 UTCEPSS rescore
  2. 2026-10-08 16:34 UTCEPSS rescore
  3. 2026-10-07 23:39 UTCEPSS rescore
  4. 2026-10-06 15:10 UTCEPSS rescore
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  7. 2026-09-30 14:58 UTCEPSS rescore
  8. 2026-09-29 20:14 UTCEG score recompute
  9. 2026-09-27 13:39 UTCEPSS rescore
  10. 2026-09-27 10:37 UTCOSV refresh
  11. 2026-09-26 15:52 UTCEPSS rescore
  12. 2026-09-24 13:57 UTCEPSS rescore
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  17. 2026-09-12 14:55 UTCEPSS rescore
  18. 2026-09-11 09:30 UTCEPSS rescore
  19. 2026-09-07 20:21 UTCOSV refresh
  20. 2026-09-07 15:56 UTCEPSS rescore
  21. 2026-09-06 13:42 UTCEPSS rescore
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  1. 2026-08-27 14:20 UTCEPSS rescore
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  5. 2026-08-21 23:44 UTCEPSS rescore
  6. 2026-08-21 05:44 UTCOSV refresh
  7. 2026-08-20 22:50 UTCEPSS rescore
  8. 2026-08-19 16:59 UTCEPSS rescore
  9. 2026-08-18 13:42 UTCEPSS rescore
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  11. 2026-08-15 01:25 UTCEPSS rescore
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  14. 2026-08-08 16:31 UTCEPSS rescore
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  16. 2026-08-06 13:42 UTCEPSS rescore
  17. 2026-08-05 20:51 UTCOSV refresh
  18. 2026-08-05 19:12 UTCEPSS rescore
  19. 2026-08-04 15:04 UTCEPSS rescore
  20. 2026-08-02 02:22 UTCEPSS rescore
  21. 2026-07-30 01:26 UTCEPSS rescore
  22. 2026-07-28 15:31 UTCEPSS rescore
  23. 2026-07-25 14:12 UTCEPSS rescore
  24. 2026-07-23 14:14 UTCEPSS rescore
  25. 2026-07-23 01:09 UTCEG score recompute
  26. 2026-07-23 00:13 UTCEG score recompute
  27. 2026-07-22 21:51 UTCEG score recompute
  28. 2026-07-22 14:04 UTCEPSS rescore
  29. 2026-07-22 14:04 UTCEPSS rescore
  30. 2026-07-21 15:21 UTCEPSS rescore
  31. 2026-07-20 17:03 UTCEPSS rescore
  32. 2026-07-20 17:03 UTCEPSS rescore
  33. 2026-07-19 21:18 UTCOSV refresh
  34. 2026-07-19 14:27 UTCEPSS rescore
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  40. 2026-07-15 16:54 UTCEPSS rescore
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  42. 2026-07-15 01:56 UTCEPSS rescore
  43. 2026-07-13 22:26 UTCEPSS rescore
  44. 2026-07-11 08:23 UTCEPSS rescore
  45. 2026-07-09 19:05 UTCEPSS rescore
  46. 2026-07-08 15:10 UTCEPSS rescore
  47. 2026-07-06 02:19 UTCEPSS rescore
  48. 2026-07-06 02:19 UTCEPSS rescore
  49. 2026-07-05 02:26 UTCEPSS rescore
  50. 2026-07-04 06:27 UTCEPSS rescore
  51. 2026-07-02 11:42 UTCOSV refresh
  52. 2026-07-01 15:02 UTCEPSS rescore
  53. 2026-06-30 23:19 UTCEPSS rescore
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  69. 2026-06-19 19:23 UTCEPSS rescore
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  71. 2026-06-18 17:49 UTCEPSS rescore
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  73. 2026-06-17 17:49 UTCEPSS rescore
  74. 2026-06-17 17:49 UTCEPSS rescore
  75. 2026-06-16 17:49 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2013-1895?
CVE-2013-1895 is a high vulnerability published on January 28, 2020. The py-bcrypt module before 0.3 for Python does not properly handle concurrent memory access, which allows attackers to bypass authentication via multiple authentication requests, which trigger the password hash to be overwritten.
When was CVE-2013-1895 disclosed?
CVE-2013-1895 was first published on January 28, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-1895 actively exploited?
CVE-2013-1895 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.8% probability of exploitation in the next 30 days (86th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2013-1895?
CVE-2013-1895 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2013-1895?
A fix for CVE-2013-1895 is available: update to the fixed version the vendor names in its advisory.

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