CVE-2017-16921

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 20%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

In OTRS 6.0.x up to and including 6.0.1, OTRS 5.0.x up to and including 5.0.24, and OTRS 4.0.x up to and including 4.0.26, an attacker who is logged into OTRS as an agent can manipulate form parameters (related to PGP) and execute arbitrary shell commands with the permissions of the OTRS or web server user.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
60
EG Risk 60/100CISA 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
Severity88% × 45%
Exploitation40% × 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
20%
EPSS %ILE
97th
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 public PoC (EG-KEV: elevated) · 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

December 8, 2017

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available.
generic🟡 PoC Available

OTRS 5.0.x/6.0.x - Remote Command Execution (1) - Perl webapps Exploit

https://www.exploit-db.com/exploits/43853/
generic

[SECURITY] [DSA 4066-1] otrs2 security update

https://www.debian.org/security/2017/dsa-4066
genericMentions a patch (unverified)

[SECURITY] [DLA 1212-1] otrs2 security update

https://lists.debian.org/debian-lts-announce/2017/12/msg00015.html
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/162295/OTRS-6.0.1-Remote-Command-Execution.html

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
otrs22.0.4p01-10 ... 6.0.1-1 (199 versions)
  • every version up to 6.0.2-1: fixed in 6.0.2-1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
otrs23.1.10+dfsg1-1 ... 3.3.9-3~bpo70+1 (49 versions)
  • every version up to 3.3.18-1~deb7u2: fixed in 3.3.18-1~deb7u2
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
otrs23.3.10-1 ... 3.3.9-3+deb8u1 (9 versions)
  • every version up to 3.3.18-1+deb8u3: fixed in 3.3.18-1+deb8u3
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
otrs22.0.4p01-10 ... 5.0.9+repack1-1 (190 versions)
  • every version up to 5.0.16-1+deb9u4: fixed in 5.0.16-1+deb9u4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 21× 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 144 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-43853
    First seen Jan 21, 2018

    OTRS 5.0.x/6.0.x - Remote Command Execution (1)

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2017-16921?
CVE-2017-16921 is a high vulnerability published on December 8, 2017. In OTRS 6.0.x up to and including 6.0.1, OTRS 5.0.x up to and including 5.0.24, and OTRS 4.0.x up to and including 4.0.26, an attacker who is logged into OTRS as an agent can manipulate form parameters (related to PGP) and execute arbitrary shell commands with the permissions of the OTRS or web…
When was CVE-2017-16921 disclosed?
CVE-2017-16921 was first published on December 8, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-16921 actively exploited?
CVE-2017-16921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-16921?
CVE-2017-16921 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2017-16921?
A fix for CVE-2017-16921 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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