CWE-329

Generation of Predictable IV with CBC Mode

The product generates and uses a predictable initialization Vector (IV) with Cipher Block Chaining (CBC) Mode, which causes algorithms to be susceptible to dictionary attacks when they are encrypted under the same key.

CVE-2017-3225 (GCVE-0-2017-3225)

Vulnerability from cvelistv5 – Published: 2018-07-24 15:00 – Updated: 2024-08-05 14:16
VLAI?
Summary
Das U-Boot is a device bootloader that can read its configuration from an AES encrypted file. For devices utilizing this environment encryption mode, U-Boot's use of a zero initialization vector may allow attacks against the underlying cryptographic implementation and allow an attacker to decrypt the data. Das U-Boot's AES-CBC encryption feature uses a zero (0) initialization vector. This allows an attacker to perform dictionary attacks on encrypted data produced by Das U-Boot to learn information about the encrypted data.
Severity ?
No CVSS data available.
CWE
Assigner
References
http://www.securityfocus.com/bid/100675 vdb-entryx_refsource_BID
https://www.kb.cert.org/vuls/id/166743 third-party-advisoryx_refsource_CERT-VN
Impacted products
Vendor Product Version
Das U-Boot Affected: 2017.09 , < 2017.09 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2017-3226 (GCVE-0-2017-3226)

Vulnerability from cvelistv5 – Published: 2018-07-24 15:00 – Updated: 2024-08-05 14:16
VLAI?
Summary
Das U-Boot is a device bootloader that can read its configuration from an AES encrypted file. Devices that make use of Das U-Boot's AES-CBC encryption feature using environment encryption (i.e., setting the configuration parameter CONFIG_ENV_AES=y) read environment variables from disk as the encrypted disk image is processed. An attacker with physical access to the device can manipulate the encrypted environment data to include a crafted two-byte sequence which triggers an error in environment variable parsing. This error condition is improperly handled by Das U-Boot, resulting in an immediate process termination with a debugging message.
Severity ?
No CVSS data available.
CWE
Assigner
References
http://www.securityfocus.com/bid/100675 vdb-entryx_refsource_BID
https://www.kb.cert.org/vuls/id/166743 third-party-advisoryx_refsource_CERT-VN
Impacted products
Vendor Product Version
Das U-Boot Affected: 2017.09 , < 2017.09 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-5408 (GCVE-0-2020-5408)

Vulnerability from cvelistv5 – Published: 2020-05-14 17:15 – Updated: 2024-09-17 01:01
VLAI?
Summary
Spring Security versions 5.3.x prior to 5.3.2, 5.2.x prior to 5.2.4, 5.1.x prior to 5.1.10, 5.0.x prior to 5.0.16 and 4.2.x prior to 4.2.16 use a fixed null initialization vector with CBC Mode in the implementation of the queryable text encryptor. A malicious user with access to the data that has been encrypted using such an encryptor may be able to derive the unencrypted values using a dictionary attack.
Severity ?
No CVSS data available.
CWE
  • CWE-329 - Not Using a Random IV with CBC Mode
Assigner
References
Impacted products
Vendor Product Version
Spring by VMware Spring Security Affected: 4.2 , < 4.2.16 (custom)
Affected: 5.0 , < 5.0.16 (custom)
Affected: 5.1 , < 5.1.10 (custom)
Affected: 5.2 , < 5.2.4 (custom)
Affected: 5.3 , < 5.3.2 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-27499 (GCVE-0-2021-27499)

Vulnerability from cvelistv5 – Published: 2021-08-02 20:42 – Updated: 2024-08-03 21:26
VLAI?
Summary
Ypsomed mylife Cloud, mylife Mobile Application, Ypsomed mylife Cloud: All versions prior to 1.7.2, Ypsomed mylife App: All versions prior to 1.7.5,The application layer encryption of the communication protocol between the Ypsomed mylife App and mylife Cloud uses non-random IVs, which allows man-in-the-middle attackers to tamper with messages.
Severity ?
No CVSS data available.
CWE
  • CWE-329 - NOT USING AN UNPREDICTABLE IV WITH CBC MODE (CWE-329)
Assigner
References
Impacted products
Vendor Product Version
n/a Ypsomed mylife Cloud, mylife Mobile Application Affected: Ypsomed mylife Cloud: All versions prior to 1.7.2, Ypsomed mylife App: All versions prior to 1.7.5
Show details on NVD website
To clipboard 

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CVE-2022-29054 (GCVE-0-2022-29054)

Vulnerability from cvelistv5 – Published: 2023-02-16 18:07 – Updated: 2024-10-22 20:49
VLAI?
Summary
A missing cryptographic steps vulnerability [CWE-325] in the functions that encrypt the DHCP and DNS keys in Fortinet FortiOS version 7.2.0, 7.0.0 through 7.0.5, 6.4.0 through 6.4.9, 6.2.x and 6.0.x may allow an attacker in possession of the encrypted key to decipher it.
Severity ?
3.1 (Low)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:U/RC:X
CWE
  • CWE-329 - Execute unauthorized code or commands
Assigner
References
Impacted products
Vendor Product Version
Fortinet FortiOS Affected: 7.2.0
Affected: 7.0.0 , ≤ 7.0.7 (semver)
Affected: 6.4.0 , ≤ 6.4.9 (semver)
Affected: 6.2.0 , ≤ 6.2.12 (semver)
Affected: 6.0.0 , ≤ 6.0.16 (semver)
Create a notification for this product.
    Fortinet FortiProxy Affected: 7.2.0 , ≤ 7.2.1 (semver)
Affected: 7.0.0 , ≤ 7.0.7 (semver)
Affected: 2.0.0 , ≤ 2.0.11 (semver)
Affected: 1.2.0 , ≤ 1.2.13 (semver)
Affected: 1.1.0 , ≤ 1.1.6 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2024-49783 (GCVE-0-2024-49783)

Vulnerability from cvelistv5 – Published: 2025-07-08 18:36 – Updated: 2025-08-24 11:21
VLAI?
Summary
IBM OpenPages with Watson 8.3 and 9.0 could provide weaker than expected security in storage of encrypted data. If an authenticated remote attacker with access to the database or a local attacker with access to server files could extract the encrypted data, they could exploit this vulnerability to use additional cryptographic methods to possibly extract the encrypted data.
Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-329 - Generation of Predictable IV with CBC Mode
Assigner
ibm
References
Impacted products
Vendor Product Version
IBM OpenPages with Watson Affected: 8.3
Affected: 9.0
    cpe:2.3:a:ibm:openpages_with_watson:8.3:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:openpages_with_watson:9.0:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-2814 (GCVE-0-2025-2814)

Vulnerability from cvelistv5 – Published: 2025-04-12 23:41 – Updated: 2025-09-05 13:21
VLAI?
Summary
Crypt::CBC versions between 1.21 and 3.05 for Perl may use the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions. This issue affects operating systems where "/dev/urandom'" is unavailable.  In that case, Crypt::CBC will fallback to use the insecure rand() function.
Severity ?
4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
  • CWE-329 - Generation of Predictable IV with CBC Mode
  • CWE-331 - Insufficient Entropy
Assigner
References
Impacted products
Vendor Product Version
LDS Crypt::CBC Affected: 1.21 , ≤ 3.05 (custom)
Create a notification for this product.
Credits
Robert Rothenberg (RRWO)
Show details on NVD website
To clipboard 

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            {
              "cweId": "CWE-329",
              "description": "CWE-329 Generation of Predictable IV with CBC Mode",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-331",
              "description": "CWE-331 Insufficient Entropy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-05T13:21:32.700Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "url": "https://perldoc.perl.org/functions/rand"
        },
        {
          "url": "https://metacpan.org/dist/Crypt-CBC/source/lib/Crypt/CBC.pm#L777"
        },
        {
          "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/lstein/Lib-Crypt-CBC/commit/37111f7cd894bcec46156ba7f40a49c126ebf535.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Users should update to a fixed version, or apply the patch provided in the references section, or use a patched version provided by their OS distribution"
            }
          ],
          "value": "Users should update to a fixed version, or apply the patch provided in the references section, or use a patched version provided by their OS distribution"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Crypt::CBC versions between 1.21 and 3.05 for Perl may use insecure rand() function for cryptographic functions",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2025-2814",
    "datePublished": "2025-04-12T23:41:48.511Z",
    "dateReserved": "2025-03-26T13:51:26.476Z",
    "dateUpdated": "2025-09-05T13:21:32.700Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}
Mitigation

Phase: Implementation

Description:

  • NIST recommends two methods of generating unpredictable IVs for CBC mode [REF-1172]. The first is to generate the IV randomly. The second method is to encrypt a nonce with the same key and cipher to be used to encrypt the plaintext. In this case the nonce must be unique but can be predictable, since the block cipher will act as a pseudo random permutation.

No CAPEC attack patterns related to this CWE.

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