CVE-2017-20240

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2026-06-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Crypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks.

These versions use Perl's built-in eq comparison. Discrepancies in timing could be used to guess the underlying derived-key.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100CISA 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
Severity59% × 45%
Exploitation0% × 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
0.3%
EPSS %ILE
22nd
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

June 12, 2026

Last Modified

June 12, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
Patch available. Sources: github_pr.
generic

oss-security - CVE-2017-20240: Crypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks

http://www.openwall.com/lists/oss-security/2026/06/12/3
generic

Client Challenge

https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes
generic

lib/Crypt/PBKDF2.pm - metacpan.org

https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.161520/source/lib/Crypt/PBKDF2.pm#L123-148
github_pr

mitigate timing attacks by taking no shortcuts

Upstream fix in progress (PR #6 · arodland/Crypt-PBKDF2, state=open)

https://github.com/arodland/Crypt-PBKDF2/pull/6

Vendor Advisories for CVE-2017-20240(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-1, 0.161520-2, 0.261630-1, 0.261630-1~deb13u1, 0.261630-1~deb13u1~deb12u1
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-2
  • every version up to 0.261630-1~deb13u1~deb12u1: fixed in 0.261630-1~deb13u1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-2, 0.261630-1~deb13u1~deb12u1
  • every version up to 0.261630-1~deb13u1: fixed in 0.261630-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libcrypt-pbkdf2-perl0.161520-2, 0.261630-1~deb13u1, 0.261630-1~deb13u1~deb12u1
  • every version up to 0.261630-1: fixed in 0.261630-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 24× 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 196 total refreshes for this CVE.

  1. 2026-10-09 20:02 UTCEPSS rescore
  2. 2026-10-08 16:36 UTCEPSS rescore
  3. 2026-10-07 23:41 UTCEPSS rescore
  4. 2026-10-06 15:12 UTCEPSS rescore
  5. 2026-10-05 17:38 UTCEPSS rescore
  6. 2026-10-04 23:18 UTCEPSS rescore
  7. 2026-10-03 14:21 UTCEPSS rescore
  8. 2026-10-03 08:39 UTCOSV refresh
  9. 2026-09-30 14:59 UTCEPSS rescore
  10. 2026-09-30 09:32 UTCEG score recompute
  11. 2026-09-28 13:45 UTCEPSS rescore
  12. 2026-09-27 13:40 UTCEPSS rescore
  13. 2026-09-27 13:40 UTCEPSS rescore
  14. 2026-09-26 15:53 UTCEPSS rescore
  15. 2026-09-24 13:59 UTCEPSS rescore
  16. 2026-09-18 19:22 UTCEPSS rescore
  17. 2026-09-17 19:22 UTCEPSS rescore
  18. 2026-09-15 03:05 UTCEPSS rescore
  19. 2026-09-15 03:05 UTCEPSS rescore
  20. 2026-09-14 04:02 UTCEG score recompute
  21. 2026-09-14 04:02 UTCGHSA enrichment
  22. 2026-09-13 16:42 UTCEPSS rescore
  23. 2026-09-12 14:55 UTCEPSS rescore
  24. 2026-09-11 09:31 UTCEPSS rescore
  25. 2026-09-07 15:56 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:43 UTCEPSS rescore
  2. 2026-09-05 15:23 UTCEPSS rescore
  3. 2026-09-04 13:56 UTCEPSS rescore
  4. 2026-09-02 14:07 UTCEPSS rescore
  5. 2026-09-02 14:07 UTCEPSS rescore
  6. 2026-09-01 03:31 UTCEPSS rescore
  7. 2026-08-30 23:44 UTCEG score recompute
  8. 2026-08-30 23:44 UTCGHSA enrichment
  9. 2026-08-30 19:13 UTCEPSS rescore
  10. 2026-08-27 14:21 UTCEPSS rescore
  11. 2026-08-26 14:41 UTCEPSS rescore
  12. 2026-08-25 13:44 UTCEPSS rescore
  13. 2026-08-24 23:50 UTCEG score recompute
  14. 2026-08-24 23:50 UTCGHSA enrichment
  15. 2026-08-23 10:29 UTCEG score recompute
  16. 2026-08-23 10:29 UTCGHSA enrichment
  17. 2026-08-21 23:44 UTCEPSS rescore
  18. 2026-08-21 17:53 UTCEG score recompute
  19. 2026-08-21 17:53 UTCGHSA enrichment
  20. 2026-08-20 22:51 UTCEPSS rescore
  21. 2026-08-20 16:30 UTCEG score recompute
  22. 2026-08-20 16:30 UTCGHSA enrichment
  23. 2026-08-19 16:59 UTCEPSS rescore
  24. 2026-08-19 13:45 UTCEG score recompute
  25. 2026-08-19 13:45 UTCGHSA enrichment
  26. 2026-08-18 13:43 UTCEPSS rescore
  27. 2026-08-17 13:42 UTCEPSS rescore
  28. 2026-08-16 23:47 UTCEG score recompute
  29. 2026-08-16 23:47 UTCGHSA enrichment
  30. 2026-08-16 14:51 UTCEPSS rescore
  31. 2026-08-16 02:10 UTCEPSS rescore
  32. 2026-08-15 23:39 UTCEG score recompute
  33. 2026-08-15 23:39 UTCGHSA enrichment
  34. 2026-08-15 01:26 UTCEPSS rescore
  35. 2026-08-14 22:21 UTCGHSA enrichment
  36. 2026-08-13 22:12 UTCEG score recompute
  37. 2026-08-13 22:12 UTCGHSA enrichment
  38. 2026-08-12 20:56 UTCEG score recompute
  39. 2026-08-12 20:56 UTCGHSA enrichment
  40. 2026-08-12 13:46 UTCEPSS rescore
  41. 2026-08-11 20:48 UTCEG score recompute
  42. 2026-08-11 20:48 UTCGHSA enrichment
  43. 2026-08-10 20:40 UTCEG score recompute
  44. 2026-08-10 20:40 UTCGHSA enrichment
  45. 2026-08-09 20:29 UTCEG score recompute
  46. 2026-08-09 20:29 UTCGHSA enrichment
  47. 2026-08-09 13:42 UTCEPSS rescore
  48. 2026-08-08 20:21 UTCEG score recompute
  49. 2026-08-08 20:21 UTCGHSA enrichment
  50. 2026-08-07 20:12 UTCEG score recompute
  51. 2026-08-07 20:12 UTCGHSA enrichment
  52. 2026-08-07 16:22 UTCEPSS rescore
  53. 2026-08-06 20:04 UTCEG score recompute
  54. 2026-08-06 20:04 UTCGHSA enrichment
  55. 2026-08-06 13:42 UTCEPSS rescore
  56. 2026-08-05 19:56 UTCEG score recompute
  57. 2026-08-05 19:56 UTCGHSA enrichment
  58. 2026-08-05 19:12 UTCEPSS rescore
  59. 2026-08-04 15:47 UTCEG score recompute
  60. 2026-08-04 15:47 UTCGHSA enrichment
  61. 2026-08-04 15:05 UTCEPSS rescore
  62. 2026-08-03 10:00 UTCGHSA enrichment
  63. 2026-08-02 09:51 UTCGHSA enrichment
  64. 2026-08-01 09:43 UTCEG score recompute
  65. 2026-08-01 09:43 UTCGHSA enrichment
  66. 2026-08-01 04:11 UTCEPSS rescore
  67. 2026-07-31 09:35 UTCEG score recompute
  68. 2026-07-31 09:35 UTCGHSA enrichment
  69. 2026-07-30 16:24 UTCEPSS rescore
  70. 2026-07-30 09:27 UTCEG score recompute
  71. 2026-07-30 09:27 UTCGHSA enrichment
  72. 2026-07-30 01:26 UTCEPSS rescore
  73. 2026-07-29 04:20 UTCEG score recompute
  74. 2026-07-29 04:20 UTCGHSA enrichment
  75. 2026-07-28 15:32 UTCEPSS rescore

Related CVEs(same product + same CWE)

Same product

2 shown

Debian:11:libcrypt-pbkdf2-perl

Frequently asked(5)

What is CVE-2017-20240?
CVE-2017-20240 is a medium vulnerability published on June 12, 2026. Crypt::PBKDF2 versions before 0.261630 for Perl are vulnerable to timing attacks. These versions use Perl's built-in eq comparison. Discrepancies in timing could be used to guess the underlying derived-key.
When was CVE-2017-20240 disclosed?
CVE-2017-20240 was first published on June 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-20240 actively exploited?
CVE-2017-20240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-20240?
CVE-2017-20240 has a CVSS v3.1 base score of 5.9 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2017-20240?
A fix for CVE-2017-20240 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2017-20240 are linked in the Vendor Advisories panel on this page.

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