CVE-2021-39152

HIGHNVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under NVD CVSS v3. EPSS exploit probability: 11% (95th 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
Trending — 3 sources updated this weekElevated
8.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 11%CVSS: 8.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.18.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
69
EG Risk 69/100CISA 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
Severity85% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; 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
11%
EPSS %ILE
95th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; 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 (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

August 23, 2021

Last Modified

October 7, 2026

Advisory Details (7)

Auto-updated Sep 2, 2026
Patch available. Sources: github.
generic

[SECURITY] [DSA 5004-1] libxstream-java security update

https://www.debian.org/security/2021/dsa-5004
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210923-0003/
generic

[SECURITY] Fedora 34 Update: xstream-1.4.18-2.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/
generic

[SECURITY] Fedora 35 Update: xstream-1.4.18-2.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/
generic

[SECURITY] Fedora 33 Update: xstream-1.4.18-2.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/
genericMentions a patch (unverified)

[SECURITY] [DLA 2769-1] libxstream-java security update

https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html
githubMentions a patch (unverified)

A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host · Advisory · x-stream/xstream · GitHub

https://github.com/x-stream/xstream/security/advisories/GHSA-xw4p-crpj-vjx2

Vendor Advisories for CVE-2021-39152(6)

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

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibxstream-java (1.4.8-1ubuntu0.1+esm1) @ xenial2026-10-07ubuntu
redhatxstream2022-02-14redhat
redhatpatch2021-11-23redhat
redhatxstream-0:1.3.1-16.el7_92021-10-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
libxstream-java1.4.11.1-1, 1.4.11.1-1+deb10u1, 1.4.11.1-1+deb10u2
  • every version up to 1.4.11.1-1+deb10u3: fixed in 1.4.11.1-1+deb10u3
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
libxstream-java1.4.15-3
  • every version up to 1.4.15-3+deb11u1: fixed in 1.4.15-3+deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libxstream-java—
  • every version up to 1.4.18-1: fixed in 1.4.18-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libxstream-java—
  • every version up to 1.4.18-1: fixed in 1.4.18-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libxstream-java—
  • every version up to 1.4.18-1: fixed in 1.4.18-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
libxstream-java1.4.10-1 ... 1.4.9-2+deb9u1 (8 versions)
  • every version up to 1.4.11.1-1+deb9u4: fixed in 1.4.11.1-1+deb9u4
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
com.thoughtworks.xstream:xstream0.1 ... 1.4.9 (42 versions)
  • every version up to 1.4.18: fixed in 1.4.18
—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 33× 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 168 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Nucleihttp/cves/2021/CVE-2021-39152.yaml
    First seen Jan 1, 2021

    XStream <1.4.18 - Server-Side Request Forgery

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-39152?
CVE-2021-39152 is a high vulnerability published on August 23, 2021. XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No…
When was CVE-2021-39152 disclosed?
CVE-2021-39152 was first published on August 23, 2021, with the most recent update on October 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-39152 actively exploited?
CVE-2021-39152 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days (95th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-39152?
CVE-2021-39152 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2021-39152?
A fix for CVE-2021-39152 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-39152 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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